book Maths Puzzle Numerical Ability

what is the percent of 1/4

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Could you help me solve the following problem?

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 interst rate increase over the period?
(1) solve the inequality

5-3x>14.

(2) solve for y: 6y^2-5y=6.