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Problem: A shop keeper prices p toys at Rs. q per toy. If the cost of each toy is increased by Rs. r, then find how much more money will be earned by the shop owner after selling p toys?​

Effort : Let the Old cost price of each toy be Rs. $x$. Then Selling price of each toy is Rs. $q $ $(>x)$. New cost price of each toy is Rs. $x+r$. New cost price of $p$ toys is Rs. $p(x+r)$ and the selling price of $p$ toys is Rs. $pq$.
I am stuck here. By the way is my approach correct?

Updated: Old cost of each toy is Rs. $q$.
Old cost of $p$ toys is Rs. $pq$.
The cost of each toy is increased by Rs. $r$. So the new cost of each toy becomes $q+r$.
The new cost of $p$ toys is Rs. $p(q+r)$.
After selling $p$ toys, the shop keeper will earn Rs. $p(q+r)-pq=pr$.

MKS
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    I think "cost of each toy" here means the amount the shopkeeper receives (i.e. the price $q$ and later $q+r$) not the amount the shopkeeper pays – Henry Feb 05 '22 at 15:27
  • @Henry Thank you very much for your correction. You will solve the problem please? – MKS Feb 05 '22 at 15:35
  • How much would the shopkeeper receive at the old price? How much would the shopkeeper receive at the new price? How much is the difference? – Henry Feb 05 '22 at 15:38
  • Surely the problem is almost ambiguous, but the only way the shopkeeper will earn more money ("how much more money?") is if they increased the price of the toy, not if the cost they pay for the toys increased. (That would bring them less money.) –  Feb 05 '22 at 15:44
  • The shopkeeper appears to earning $pq-p(x+r)=p(q-x-r)$. If this is not what you mean please let us know more precisely what is required. –  Feb 05 '22 at 16:32

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