Jeremiah inherited some money from his grandfather and put it in a bank account that earns 9% interest compounded monthly. After 7 years, Jeremiah had 600.00 in the bank account. How much interest did he earn?

解答

J ere miah 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 9% in t eres t co m p o u n d e d m o n t h l y . A f t er 7 ye a rs, J ere miah ha d 600.00 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 : 279.69

求解步骤

Translate the problem into an equation:

600 = 320.30715 \dots + I

求解

I, 600 = 320.30715 \dots + I : I = 279.69

Interest : 279.69