exam Maths Puzzle Numerical Ability

The problem I am trying to solve is: M/p2k + 4a/3pk - 6/5pk2 (slash indicate division sign and the numbers 2 on the bottom indicate exponents). I have solved as to the point of 15p

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n + 3 5/6 = 3 1/3 jan invested $1200 at a certain simple interest rate and $2200 at a rate 3% higher. her annual earnings were $253. find the two interest ratesif earned $121 more on the larger inve