To Express one quantity depth as percentage of another (WP-32: Percentage %)

Q. Underground water in Islamabad has fallen from 80 feet to 240 feet in last 10 years. What percentage of water has fallen?

Steps for solving: (Hints)  

Step 1: Divide 240 feet into 80 feet ( new to old one)

Step 2: Multiply the result by 100 % and simplify to obtain quantity in percentage. 

Step 3: Place the sign of percentage after the result. 

Solution: 

Water level before 10 years  = 80 feet

Water level after 10 years  = 240 feet

240 feet as a percentage of 80 feet = 

`\frac {240}{80}times 100` = 300 %


Thus, water in Islamabad has fallen 300 % in the last 10 years.

Similar Question:

Express:  Rs. 40 as a percentage of Rs. 80

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The height of a mango tree is 20 m and the height of a banana tree is 5 m. Express the height of mango tree as a percentage of height of banana tree.

Monthly income of Arshad and Asghar is Rs. 9500 and Rs. 10500 respectively. Express Arshad's income as a percentage of Asghar's income.

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