What is his percentage profit made by Osborn if he purchased 30 dozen watches at Rs. 50 per dozen. He sold 12 dozens at 12% profit and the remaining 18 dozens with 17% profit?
Choose the most appropriate option:
A) 12.6%
B) 13.6%
C) 16.6%
D) 15.6%
E) 14.6%
Explanation :   C.P of 30 dozen = Rs.(50 x 30) = Rs.1500   C.P of 12 dozen = Rs. (50 x12) = Rs. 600.   C.P of 18 dozen =Rs. (50 x18) = Rs. 900   profit on 12 dozen at 12% = 12/100*600= 
<gadget id="calculator">12/100*600</gadget>
<output>72</output>
72   profit on 18 remaining dozen at 18%= 18/100*900= 
<gadget id="calculator">18/100*900</gadget>
<output>162</output>
162   total profit= 72 + 162= 
<gadget id="calculator">72 + 162</gadget>
<output>234</output>
234   % profit= ?/100*1500 = 234   = 15.6%   Answer : 15.6%
<result>D</result>
What is his percentage profit made by Osborn if he purchased 30 dozen watches at Rs. 50 per dozen. He sold 12 dozens at 12% profit and the remaining 18 dozens with 17% profit?