A number is increased by 30 % and then decreased by 30 %. Find the net increase or decrease per cent.  Answers:	A) 9%	B) 8%	C) 7%	D) 3%	E) 6%
Let the number be 100.   Increase in the number = 30 % = 30 % of 100   = (30/100 Ã— 100)   = 30   Therefore, increased number = 100 + 30= 
<gadget id="calculator">100 + 30</gadget>
<output>130</output>
130   This number is decreased by 30 %   Therefore, decrease in number= 30 % of 130   = (30/100 Ã— 130)   = 3900/100= 
<gadget id="calculator">3900/100</gadget>
<output>39</output>
39   Therefore, new number= 130 - 39= 
<gadget id="calculator">130 - 39</gadget>
<output>91</output>
91   Thus, net decreases= 100 -91= 
<gadget id="calculator">100 -91</gadget>
<output>9</output>
9   Hence, net percentage decrease= (9/100 Ã— 100) %   = (900/100)= 
<gadget id="calculator">(900/100)</gadget>
<output>9</output>
9 %   9%nswer:9%
<result>A</result>
A number is increased by 30 % and then decreased by 30 %. Find the net increase or decrease per cent.