Last year Kareem had $ 20 , 000 to invest. He invested some of it in an account that paid 8 % simple interest per year, and he invested the rest of it in an account that paid 7 % simple interest per year. After one year, he received a total of $ 1610 in interest. How much did he invest in each account?

c is the correct answer

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its electric no smoke

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answer: c, the green line

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there is no black line, eliminate b.

simple interest implies periodic payments, but the red line shows no payments, eliminate d.

simple interest has equal payments. if paid say every day, the graph is about a straight line (actually a stairstep).

the yellow line is not straight, eliminate a.

check: the green line is straight, answer is c.

simple interest with positive interest rate gives a straight line sloping up to the right. green line:

g(t) = $100 + ($200-$100) ÷ (20 years) × (t years)

= $100 + (4%/year) × ($100)(t years)

incidentally, the yellow line curving upward represents continuously compounded interest

y = $100 × 2^(t years / (14 assuming the yellow line hits $200 at 14 years. 2^0 is 1, so y(0) = $100; 2^(14/14) is 2, so y(14) = $200.

it is a secret for it not to be compromised sorry

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