book Maths Puzzle Numerical Ability

A man has 3 times as much money invested in 12% bonds as he has in stocks paying 9%. If his yearly income from the investments is $2,700, what is his total investment is?

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Please show me how to solve this problem thanks.

John made 4 payments on his car with each one 10% less than the previous one. If the total of all 4 payments was $6878, how much Suppose that $4,000 is invested at 6% compounded weekly. How much money will be in the account in

(A) l/2 year
(B) 10 years?