Mala had a stock of 1200 balls in his bookshop. He sold 50 on Monday, 100 on Tuesday, 120 on Wednesday, 150 on Thursday and 200 on Friday. What percentage of the balls were not sold? Choose the most appropriate option
A) 26.3%
B) 42.5%
C) 38.6%
D) 48.3%
E) 52.8%
Let N be the total number of balls sold. Hence   N = 50+ 100 + 120 + 150 + 200= 
<gadget id="calculator">50+ 100 + 120 + 150 + 200</gadget>
<output>620</output>
620   Let M be the balls NOT sold   M= 1200 - N = 1200 - 620= 
<gadget id="calculator">1200 - 620</gadget>
<output>580</output>
580   Percentage   Balls not sold / total number of balls= 580/1200 = 0.483 =48.3%   correct answer 48.3%
<result>D</result>
Mala had a stock of 1200 balls in his bookshop. He sold 50 on Monday, 100 on Tuesday, 120 on Wednesday, 150 on Thursday and 200 on Friday. What percentage of the balls were not sold?