plz explain......... it
1)In a group of 200. 100 are interested in music, 70 in photography and 40 in swimming .
40 are interested in both music and photography, 30 in music and swimming. 20 in photography and swimming and 10 in all the three. How many are interested in photography but not in music or swimming?
a) 30 b) 15 c) 25 d) 20
2)Given the prices of 2 commodities are increased by 10% and 20% respectively and the price of another commodity is decreased by 30%.
The relative importance of 3 commodities are in the ratio 3:3:1. Find weighted price index number.
a) 80 b) 109 c) 110 d) 108.5
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