Lamar earned some money doing odd jobs last summer and put it in a savings account that earns 11% interest compounded continuously. After 1 year, there is 100.00 in the account. How much did Lamar earn doing odd jobs?

解答

L ama r e a r n e d so m e m o n ey d o in g o dd j o b s l a s t s u mm er an d p u t i t in a s a v in g s a cco u n t t ha t e a r n s 11% in t eres t co m p o u n d e d co n t in u o u s l y . A f t er 1 ye a r, t h ere i s 100.00 in t h e a cco u n t . Ho w m u c h d i d L ama r e a r n d o in g o dd j o b s ?

Principal : 89.58

求解步骤

Translate the problem into an equation:

100 = P e^{0.11 \cdot 1}

求解

P, 100 = P e^{0.11 \cdot 1} : P = 89.58

Principal : 89.58