i = 20% / 4 = 5% per quarter
A. Payment each quarter = 1250 * (A/P,5%,5)
= 1250 * 0.05 * ((1 + 0.05)^5)/((1 + 0.05)^5-1)
= 1250 * 0.05 * (1.05^5)/(1.05^5-1)
= 1250 * 0.230975
= 288.72
B. Nominal interest rate = 20% compounded quarterly
C. Effective interest rate = (1+0.05)^4 -1
= 1.05^4 -1
= 1.2155 - 1
= 0.2155 ~ 21.55%
Pls comment if you think final solution is wrong or you require further explanation
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