这是一道英语的数学题,请大家帮忙! 谢谢了!

题目

这是一道英语的数学题,请大家帮忙! 谢谢了!
16. Maggie deposits a sum of money in a bank at an interest rate of 7％ p.a. compounded half-yearly.If the interest she received after 3 years is 1834, find the principal.

答案

Let the pricipal be P
p*(1+0.07/2)^6=1834+P
1.22P=1834+P
P=7999.81=8000