The profits of QRS company rose 10% from March to April, then dropped 20% from April to May, then rose 50% from May to June. What was the percent increase for the whole quarter, from March to June? Choose the correct choice from the following choices.
A) 15% B) 32% C) 40% D) 62% E) 80%
We need multipliers.   multiplier for a 10% increases = 1 + 0.10= 
<gadget id="calculator">1 + 0.10</gadget>
<output>1.1</output>
1.1   multiplier for a 20% decreases= 1 – 0.20 = 0.8   multiplier for a 50% increases = 1 + 0.50= 
<gadget id="calculator">1 + 0.50</gadget>
<output>1.5</output>
1.5   Now, multiply these. First, multiply (0.8) and (1.5), using the doubling &amp; halving trick. Half of 0.80 is 0.40, and twice 1.5 is 3   (0.8)*(1.5)= (0.4)*(3)= 
<gadget id="calculator">(0.4)*(3)</gadget>
<output>1.2</output>
1.2   Now, multiply this by 1.1   1.2*1.1= 
<gadget id="calculator">1.2*1.1</gadget>
<output>1.32</output>
1.32   Thus, the three percent changes combined produce a 32% increase. Answer= (32%).
<result>B</result>
The profits of QRS company rose 10% from March to April, then dropped 20% from April to May, then rose 50% from May to June. What was the percent increase for the whole quarter, from March to June?