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There are two groups A and B in a shop . In the group A, 50 toys have been sold the average price of each toy being Rs. 15 . In group B there also have been sold 30 toys, the average price of which is Rs. 20 each . Find the average of average selling price of the total 80 toys sold in the shop.

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Here , the total selling price of 50 toys in group A =Rs. 50`xx`50 =Rs. 750
The total selling price =Rs. (750+600)=Rs. 1350
`therefore ` the required average =Rs.`(1350)/(50+30)=Rs. (1350)/(80)=Rs. 16.87` (approx.)
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