`E_(P)` of a good is -4. When price of this good rises from Rs. 5 to Rs. 6 per unit , a consumer busy 40 units less . How many units did he buy at Rs.
`E_(P)` of a good is -4. When price of this good rises from Rs. 5 to Rs. 6 per unit , a consumer busy 40 units less . How many units did he buy at Rs. 5 ?
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