( Original amount - New amount) Decrease %= ----------------------------------- x 100 Original amount |

1) Find the decrease % of a) $80 to $60 b) $155 to $130

a) $80 to $60

Original amount= $80

Net amount = $60

( Original amount - New amount) Decrease %= ----------------------------------- x 100 Original amount |

( 80 - 60) Decrease %= ------------ x 100 80 |

= (20/80) x 100

= 0.25 x 100

So, Decrease % = 25

_________________________________________________________________

b) $155 to $130

Original amount= $155

Net amount = $130

( Original amount - New amount) Decrease %= ----------------------------------- x 100 Original amount |

(155 - 130) Decrease %= ------------ x 100 155 |

= (25/155) x 100

= 0.16129 x 100

So, Decrease % = 16.129

_________________________________________________________________

2) On Sunday 845 people went to the Zoo. On Monday only 169 people went. What is the per cent decrease in the people visiting the Zoo on Monday?

Original amount = 845

New amount = 169

( Original amount - New amount) Decrease %= ----------------------------------- x 100 Original amount |

( 845 -169) Decrease %= --------------- x 100 845 |

= (676/845) x 100

= 0.8 x 100

So, Decrease % = 80

_________________________________________________________________

3) A man got 10% decrease in purchasing a machine . If the new price of the machine was $3000, find the original price of the machine.

Decrease % = 10

New amount = $3000

Let original amount be $p.

( Original amount - New amount) Decrease %= ----------------------------------- x 100 Original amount |

( p - 3000) 10 % = ---------------------- x 100 p |

Cross multiply

10p = (p - 3000) x 100

10p = 100p - 300,000

10p-100p = -300,000

-90p = - 300,000

So, p = 300,000/90 p = $3333.33

• Conversion of Percentage to Fraction

• Conversion of Fraction to Percent

• Conversion of Percentage to Decimal

• Conversion of Decimal to Percent

• Find the Percentage of a given number

• What Percent is one number of another number

• Percentage as a comparison of two quantities

• Increase Percent

• Decrease Percent

GMAT

GRE

1st Grade

2nd Grade

3rd Grade

4th Grade

5th Grade

6th Grade

7th grade math

8th grade math

9th grade math

10th grade math

11th grade math

12th grade math

Precalculus

Worksheets

Chapter wise Test

MCQ's

Math Dictionary

Graph Dictionary

Multiplicative tables

Math Teasers

NTSE

Chinese Numbers

CBSE Sample Papers