How do you find the new amount given 80 members decreased by 65%?

2 Answers
Aug 24, 2017

See a solution process below:

Explanation:

We can write an equation for this problem as:

n = m + (m * r)

Where:

n is the new number of members. What we are solving for.

m is the original number of members. 80 for this problem.

r is the rate of change in membership. -65% for this problem because there was a decrease in the number of members. "Percent" or "%" means "out of 100" or "per 100", Therefore -65% can be written as -65/100.

Substituting and calculating n gives:

n = 80 + (80 * -65/100)

n = 80 + (-5200/100)

n = 80 + (-52)

n = 80 - 52

n = 28

There are now 28 members.

Aug 24, 2017

28 members

Explanation:

If there is a decrease of 65% , it means that 100%-65% = 35% of the members are left.

So we just need to find 35% of 80.

35/100 xx 80 = 28 members.

The other way is to find the actual decrease, which is:

65/100 xx 80 = 52 members

80-52 = 28 members remain.