Math Is Fun Forum

rkm-87

Member

Registered: 2007-11-09

Posts: 1

percentage

please help me I have problem with concept of percentage

an increase of $0,15 on a price of 2,50 is an increse by a fraction of 0.15/2.50=0,06

expressed as a percentage,therefore a 6% increase

I don,t understand this

and why we put 0.15 is numerator

Is percentage is change over the whole

LuisRodg

Real Member

Registered: 2007-10-23

Posts: 322

Re: percentage

One way you can understand this is to setup percentages as ratios of fractions.

You can say:

0.15/2.50 = x/100

In here your saying that 0.15 is to 2.50 as x is to 100. In here x represents the percentage increase. If you solve for x then:

x = 15/2.5
x = 6

which gives you the percentage.