can someone explain why this is the case?

MGT 5 - MANAGERIAL ACCOUNTING PROBLEM 2 GIVEN: VARIABLE COST/UNIT FIXED COSTS/UNIT UNITS 22,500 FIXED COSTS INCREASE BY 25% AT 23,000 UNITS REQUIRED: TOTAL COST PER/UNIT AT 25,000 UNITS 15.00 4.50 19.50 REQUIRED: TOTAL COST PER/UNIT AT 30,000 UNITS ANSWER VC/UNIT FC/UNIT TC/UNIT ANSWER VC/UNIT FC/UNIT TC/UNIT ANSWER 600,000 15.00 3.75 18.75 REQUIRED: TOTAL COSTS AT 32,500 UNITS