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標題:

英文數學應用題(Simple Interest)

發問:

(1) If principal=$3000, interest rate=2.5% p.a., simple interest=$225, what is the time? (2) If principal=$12000, interest rate=5% p.a. simple interest,amount=$15000,what is the time?

最佳解答:

(a) Let x be the time. (3000)(2.5%)(x)=225 75x=225 x=3 ∴ The time is 3 years. (b) Let x be the time. (12000)(5%)(x)+12000=15000 600x+12000=15000 x=5 ∴The time is 5 years

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其他解答:

1) let t years be the time . 3000 x 2.5% x t = 225 75t = 225 t = 3 ∴ The time is 3 years. 2) let t years be the time. 12000 x 5% x t = 15000 - 12000 600t = 3000 t = 5 ∴ The time is 5 years.1C924F1C0172E337