find the percentage of increase or decrease. 1) price of shirt decreased from Rs 80 to Rs 60.  2) marks in a test increased from 20 to 30

Dear Student,

[Equation]

1) Original price = Rs.80
initial price = Rs.60
So , decreased price = original price - initial price =
= Rs.80 - Rs.60
= Rs.20

Thus , Decreased price % =
= decreased price / original price * 100
= Rs.20 / Rs.80 * 100
= Rs.2000 / Rs.80
= 25 % [ ANS...]



2) Original Marks = 20 marks
Initial Marks = 30 marks
So , Increased Marks =? Initial Marks - Original Marks =
= ( 30 - 20 ) marks
= 10 marks

Thus , Increased Marks % =
= Increased Marks / Original Marks * 100
= 10 / 20 * 100
= 1000 / 20
= 50 % [ ANS...]


Hope your doubts are clear.
Best Wishes.

Regards ,