Please answer it in 6 hours, its emergency! (Before 23th May 6:00am)

and Please give me step by step solution

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Consider an n-payment annuity-immediate with payments P+D, P+D, P+2D, P+2D,..., P+D,P+ +D, P+D 2 where n is an even integer. Let i be the effective rate per period. Show that the present value of such an annuity is n Pani + D D (179) kv k Consider an n-payment annuity-immediate with payments P+D, P+D, P+2D, P+2D,..., P+D,P+ +D, P+D 2 where n is an even integer. Let i be the effective rate per period. Show that the present value of such an annuity is n Pani + D D (179) kv k