URGENT! What function is the IRR found in this example? URGENT! PLEASE EXPLAIN

1 1 2 3 4 4 5 6 7 8 9 10 11 12 13 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 REVENUE BENEFIT PROJECT COST 2 3 o 16,783,505 0 84,494,877 108,283,439 43,406,483 EXPENDITURE EXPENDITURE FLOW CASH FLOW 0.095 7 0.1273 7 (3+4)-5 (2-5)-6 0 16,783,505 -16,783,505 -15,327,402 -14,887,806 0 -70,469.654 -66,485,424 0 0 0 0 o 27,793,881 84,494,877 -84,494,877 108,283,439 -108,283,439 -82,474,498 -75,579,869 43,406,483 -43,406,483 -30,192,434 -26,874,892 4,818,444 56,849,108 23,561,655 20,972,703 4,818,444 56,849,108 21,517,493 18,603,833 4,818,444 56,849,108 19,650,679 16,502,527 61,667,552 61,667,552 0 27,793,881 27,793,881 61,667,552 61,667,552 0 0 27,793,881 0 27,793,881 4,818,444 56,849,108 17,945,825 14,638,565 61,667,552 4,818,444 56,849,106 16,388,882 12,985,137 0 27,793,881 4,818,444 56,849,108 14,967,015 11,518,464 8,039,678 61,667,552 61,667,552 61,667,552 61,667,552 61,667,552 61,667,552 61,667,552 61,667,552 61,667,552 4,818,444 56,849.108 13,668,507 10,217,452 4,818,444 56,849,108 12,482,655 9,063,389 4,818,444 56,849,108 11,399,685 4,818,444 56,849,108 10,410,671 4,818,444 56,849,108 9,507,462 4,818,444 56,849,106 8,682,614 7,131,595 6,326,081 5,611,549 4,818,444 56,849,106 7,929,328 4,977,724 4,818,444 56,849,108 7,241,395 4,415,489 56,849,108 0 27,793,881 0 27,793,881 0 27,793,881 0 27,793,881 0 27,793,881 0 27,793,881 0 27,793,881 0 27.793.881 ol 27,793,881 0 27,793,881 o 27,793,881 0 27,793,881 4,818,444 56,849,108 5,036,928 0 27,793,881 4,818,444 56,849,106 4,599,934 o 27,793,881 4,818,444 56,849,108 4,200,853 5,309,926 27,793,881 10,128,370 27,793,881 27,793,881 6,613,146 61,667.552 61,667,552 3,916,759 4,818,444 4,818,444 4,818,444 56,849,108 56,849.108 6,039,403 3,474,360 61,667,552 5,515,436 3,081,931 61,667.552 2,733,826 61,667,552 2,425,040 61,667,552 2,151,132 61,667,552 51,539,182 3,235,015 1,609,044 61,667,552 0 56,849,108 3,503,558 1,692,634 61,667,552 56,849,108 3.199,596 1,501,451 61,667,552 1,331,862 4,818,444 0 4,818,444 0 27,793,881 4,818,444 o 27,793,881 0 27,793,881 0 27,793,681 o 27,793,881 4,818,444 56,849,106 2,032,472 61,667,552 61,667,552 61,667,552 1,181,428 56,849,108 2.922,006 4,818,444 56,849,108 2,668,498 4,818,444 56,849,108 2,436,985 4,818,444 56,849,106 1,047,985 2,225,557 929,615 61,667,552 824,615 61,667,552 56,849,108 1,856,139 731,475 61,667,552 56,849,108 1,695,104 648,855 61,667,552 4,818,444 56,849,108 1.548,040 575,566 61,667,552 4,818,444 56,849,108 1,413,735 510,556 61,667,552 4,818,444 56,849,108 1,291,082 452,889 27,793,881 4,818,444 0 27,793,881 4,818,444 0 27,793,881 0 27,793,881 o 27,793,881 0 27,793,881 27,793,681 27,793,881 27,793,881 4,818,444 56,849,108 27,793,881 4,818,444 56,849,108 61,667,552 4,818,444 56,849,106 1,179,071 401,735 61,667,552 0 4,818,444 56,849,106 1,076,777 356,359 61,667,552 113,278,426 118.096,870 -56,429,318 -2,305,132 -741,003 61,667,552 898,044 280,404 61,667,552 0 820,131 248,732 61,667,552 0 4,818,444 56,849,108 748,978 220,638 61,667,552 0 27,793,881 27,793,881 4,818,444 56,849,108 27,793,881 10,128,370 51,539,182 683,998 195,717 61,667,552 5,309,926 526,737 146,396 61,667,552 0 27,793,881 56,649,108 570,462 154,001 4,818,444 4,818,444 61,667,552 0 27,793,881 520.970 136,607 61,667,552 56,849,106 27,793,881 4,818,444 56,849,106 o 27,793,881 4,818,444 56,849,108 0 475,772 121.177 61,667,552 434,495 107,490 61,667,552 20,737,887 153,874 36,975 61,667,552 0 362,373 84,579 61,667,552 0 330,935 75,026 61,667,552 27,793,881 25,556,331 36,111,221 27,793,881 4,818,444 56,849,108 27,793,881 4,818,444 56,849,108 4,818,444 56,849,108 4,818,444 56,849,108 4,818,444 302,223 66,552 0 27,793,881 o 27,793,881 0 27,793,881 276,003 61,667,552 61,667,552 59,035 56,849,108 252,058 52.367 TOTAL 66.231,134 INTERNAL RATE OF RETURN (IRR) % PRESENT VALUE O&M 4 12.73%