book Maths Puzzle Numerical Ability

MR.SELL BOUGHT THREE DOGHNUTS AND A 44-OUNCE THERMAL CUP OF COFFE ONHIS WAY TO SCHOOL. IF THE COFFE COST WAS $1.95 AND THE TOTAL OF HIS PURCHASE [BEFOERE TAX] WAS $3.60, HOW MUCH DID EACH DOUGHNUT COST?

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If f(x)=3x^2-2 find f^(-1) last year pete decided to invest half of his money in a credit union paying 4.5% interest, one-third of his money in a mutual fund paying 5% interest, and the rest of his money in