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Sales in the printing business have doubled for James in each of the last three months. During the last month, he made a profit of $520. If the pattern continues, what will be his three month total profit at the end of the next three months?

Sagot :

The equation for his currnet sales can be as follows:
x=520*2^n
n is the current month
We are looking for the sum of next 3 months, so n+1, n+2 and n+3.

520*2^(n+1)+520*2^(n+2)+520*2^(n+3)=520*4+520*8+520*16=2080+4160+8320=14560