2 years ago, Harold won some money in the lottery and put it in a bank account that earns 7% interest compounded monthly. If Harold currently has 100.00 in the bank account, how much interest has he earned?

解答

2 ye a rs a g o, H a ro l d w o n so m e m o n ey in t h e l o tt ery an d p u t i t in a bank a cco u n t t ha t e a r n s 7% in t eres t co m p o u n d e d m o n t h l y . I f H a ro l d c u rre n tl y ha s 100.00 in t h e bank a cco u n t, h o w m u c h in t eres t ha s h e e a r n e d ?

Interest : 13.03

求解步骤

Translate the problem into an equation:

100 = 86.97119 \dots + I

求解

I, 100 = 86.97119 \dots + I : I = 13.03

Interest : 13.03