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The distributive property of multiplication over addition and the identity property of multiplication. RS + RS = 1*RS + 1*RS (using identity property) = (1 + 1)*RS (using distributive property) = 2*RS
One pen cost 4.05 and so two pens cost 2*4.05 = 8.1 Rs
Rs 1600.
Only combination that will work is 2 watermelons @ Rs 5 and 4 pineapples @ Rs 7, otherwise you will have to cut up the pineapples and watermelons and only buy parts of each.
If PQ and RS are two 2-digit numbers, then PQ * RS = 100*P*R + 10*P*S + 10*Q*R + Q*S