5 years ago, Brett won some money in the lottery and put it in a bank account that earns 14% interest compounded annually. If Brett currently has 400.00 in the bank account, how much interest has he earned?

פתרון

5 ye a rs a g o, B re tt 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 14% in t eres t co m p o u n d e d ann u a ll y . I f B re tt c u rre n tl y ha s 400.00 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 : 192.25

צעדי פתרון

Translate the problem into an equation:

400 = 207.74746 \dots + I

400 = 207.74746 \dots + I, I

פתור בשביל:

I = 192.25

Interest : 192.25