exam Maths Puzzle Numerical Ability

P is True, q and r are False- find the truth value.
a) (p ^ ~q) ^ r



b) ~(q ~ r)

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exam Other Question
On October 1, $24000 is invested, earning 6.4% annually, compounded monthly. Beginning on November 1, a monthly withdrawal of $100 is made and the withdrawals continue on the firs bob invested $20,00, part at 14% and part at 13%. If the total interest at the end of the year is $2,720, how much did he invest at 14%?