Question

帮我做下.顺便讲下为什么2. A sum of money is deposited in a bank for 2 y

Answer 1

Assume that the principal is x.

so x*（1+8%）^2=$12480 x=10700（约等于）

so the principal is 10700.

50*（1+7%）*（1-7%）=49.755 （50-49.755）/50=0.49%

so the final value is 49.755

the percentage change is 0.49%

第一问是已知本利和复利求本金,第二问是求50变动两次的最终值和变动的最终百分比.

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