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For example, if price of bananas per dozen is rs.p

And bananas needed for picnic are z dozens then we

Have to pay=rs.p×z suppose the price per dozen was less by 2 and bananas

Needed were less by 4 dozens

The price of bananas per dozen=rs(p-2)and

Bananas needed =(z-4)dozens therefore, we

Would have to pay=rs(p-2)×(z-4)

if you have some calculation, you can easily do it by identities.