Sadie invested 13,000 in an account paying an interest rate of 2.3% compounded daily. Assuming no deposits or withdrawals are made, how long would it take, to the nearest tenth of a year, for the value of the account to reach 16,900?

Solution

S a d i e in v es t e d 13, 000 in an a cco u n t p a y in g an in t eres t r a t e o f 2.3% co m p o u n d e d d ai l y . A ss u min g n o d e p os i t s or w i t h d r a w a l s a re ma d e, h o w l o n g w o u l d i t t ak e, t o t h e n e a res t t e n t h o f a ye a r, f or t h e v a l u e o f t h e a cco u n t t o re a c h 16, 900 ?

Time : 11.41

Solution steps

Translate the problem into an equation:

16900 = 13000 (1 + \frac{0.023}{365})^{365 t}

Solve for

t, 16900 = 13000 (1 + \frac{0.023}{365})^{365 t} : t = 11.41

Time : 11.41