exam Maths Puzzle Numerical Ability

Multiply, using the vertical method.

(m squared - 5mn+3n squared)(m squared + 4mn-2n squared)

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exam Other Question

Victor borrowed $10,500. To repay the loan, he was scheduled to make 48 monthly installment payments of $243.23 each. Instead of making his 36th payment, he decides to pay off the a reduction of 20% enable a purchaser to get 4kg more at Rs:80 the original price of 1kg of suger is ?
please solve it....