Estelle inherited some money from her grandfather and put it in a bank account that earns 9% interest compounded monthly. After 2 years, Estelle had 700.00 in the bank account. How much interest did she earn?

الحلّ

E s t e ll e inh er i t e d so m e m o n ey f ro m h er 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 2 ye a rs, E s t e ll e ha d 700.00 in t h e bank a cco u n t . Ho w m u c h in t eres t d i d s h e e a r n ?

Interest : 114.92

خطوات الحلّ

Translate the problem into an equation:

700 = 585.08198 \dots + I

700 = 585.08198 \dots + I, I

حلّ لـ:

I = 114.92

Interest : 114.92