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timama [110]
4 years ago
15

I am getting stuxk on this question

Mathematics
1 answer:
grandymaker [24]4 years ago
4 0
Answer: Choice B) 3 years

--------------------------------------

Explanation:

The simple interest formula is
i = P*r*t
where,
i = interest
P = principal
r = interest rate in decimal form
t = time in years

In this case,
i = 840
P = 7000
r = 0.04 (move the decimal point 2 spots to the left go to from 4% to 0.04)
t = unknown; we'll leave it as t

Plug the given values above and solve for, or isolate, t
i = P*r*t 
840 = 7000*0.04*t 
840 = 280*t 
840/280 = 280*t/280 
3 = t
t = 3

It will take 3 years
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