Kenji inherited some money from his grandfather and put it in a bank account that earns 15% interest compounded annually. After 9 years, Kenji had 1,000.00 in the bank account. How much interest did he earn?

Soluzione

Ke nji inh er i t e d so m e m o n ey f ro m hi s g r an df a t h er an d p u t i t in a bank a cco u n t t ha t e a r n s 15% in t eres t co m p o u n d e d ann u a ll y . A f t er 9 ye a rs, Ke nji ha d 1, 000.00 in t h e bank a cco u n t . Ho w m u c h in t eres t d i d h e e a r n ?

Interest : 715.74

Fasi della soluzione

Translate the problem into an equation:

1000 = 284.26241 \dots + I

Risolvi per

I, 1000 = 284.26241 \dots + I : I = 715.74

Interest : 715.74