Makayla invested 630 in an account paying an interest rate of 5.5% compounded continuously. Assuming no deposits or withdrawals are made, how long would it take, to the nearest year, for the value of the account to reach 1,860?

Solution

M aka y l a in v es t e d 630 in an a cco u n t p a y in g an in t eres t r a t e o f 5.5% co m p o u n d e d co n t in u o u s 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 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 1, 860 ?

Time : 19.68

Solution steps

Translate the problem into an equation:

1860 = 630 e^{0.055 t}

Solve for

t, 1860 = 630 e^{0.055 t} : t = 19.68

Time : 19.68