In 1985, there were 285 cell phone subscribers in the small town of Glenwood. The number of subscribers increased by 75% per year after 1985. How many cell phone subscribers were in Glenwood in 1990? Years 1986 (x = 1) 1987 (x = 2) 1988 (x = 3) Number of cell phone users 498 872 1527 a. 1800 c. 2672 b. 4677 d. 8186 Please select the best answer from the choices providednd A

b. (4677)

Explanation:

You can apply the same equation we use to calculate the compound interest but with phones.

Look:

M = C.(1+i)^n

M = the total amount after 5 years

C = the firts amout of phones (285)

i = how much this number gets bigger (75%)

n = the number of periods (5 years)

So...

M = 285 . (1 + 0,75)^5

M = 285 . 1,75^5

M = 285 . 16.4

M = 4677

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