A man buys oranges at Rs. 5 a dozen and an equal number at Rs. 4 dozen. He sells them at Rs 5.50 a dozen and makes a profit of Rs. 50. How many dozen oranges did he buy ?
30
40
50
25
60
CP of 2 dozen oranges = 5 + 4 = 9
SP of 2 dozen oranges = 11
If profit is Rs 2, orange bought = 2 dozen
Then at profit of Rs 50 orange bought= 50 dozen