book Maths Puzzle Numerical Ability

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The interest rate on an auto loan in May was 12 3/8%. By September the rate was up to 14 1/4%. How many percentage points did the interest rate increase over the period?

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Isolate for "t": m=16t^2+vt+7
thanks, i cant seem to figure it out... are you supposed to divide it out? FIND THE COST PER UNIT DURING A WEEK WHEN THE TOTAL COST WAS 68,000, THE NUMBER OF UNITS PRODUCED WAS 500, AND THE FIXED COSTS WERE 8000. USE THE FORMULA T=U TIMES N+F, WHERE T IS