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人気のある Word Problems >

Find the time required for an investment of 5000 dollars to grow to 8000 dollars at an interest rate of 7.5 percent per year, compounded quarterly.

解

F in d t h e t im e re q u i re d f or an in v es t m e n t o f 5000 d o ll a rs t o g ro w t o 8000 d o ll a rs a t an in t eres t r a t e o f 7.5 p erce n t p er ye a r, co m p o u n d e d q u a r t er l y .

解

Time : 6.33

解答ステップ

Translate the problem into an equation:

8000 = 5000 (1 + \frac{0.075}{4})^{4 t}

t

を解く

8000 = 5000 (1 + \frac{0.075}{4})^{4 t} : t = 6.33

Time : 6.33

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