book Maths Puzzle Numerical Ability

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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

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DIFFERENCIATION:
IF Y=1/1+X,SHOW THAT
(1+X)d2y/dx2+2dy/dx=0 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?