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On Saturday, the original price of a shirt was discounted by 20%. On Monday, the price of the shirt was marked up p percent so that the new price on Monday was 20% more than the original price before the discount. What is the value of p?
A. 20%
B. 30%
C. 33 1⁄3%
D. 40%
E. 50%

Let the original price be 100
discounted Price = 80
New Price = 20 +100 =120
P=(40/80)*100

Ans:E
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Let original cost price be x
On Saturday Price is=x-.2x=0.8x
On monday,Price is increased by p%=0.8x+p%of 0.8x
this is equal to x+.2x=1.2x

0.8x+0.8px/100=1.2x
0.8x(1+p/100)=1.2x
1+p/100=3/2
p/100=1/2
p=50%
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