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Answer:
2.76%
Step-by-step explanation:
The effective rate is found by comparing the interest to the proceeds of the loan.
I = Prt . . . . . . formula for simple interest
r = I/(Pt)
Here, $25 was paid in interest on loan proceeds of $725. 15 months is 15/12 = 1.25 years. So, the effective rate is ...
r = 25/(725×1.25) ≈ 0.027586 ≈ 2.76%
The effective interest rate is about 2.76%.