Question

The cost per minute for a conference phone call, originally $2.60, increased by 30%. What is the new price?

$2.90

$3.20

$3.38

$3.48
show your work

Answer 1

2.6(100%+30%)=3.38

the answer is $3.38

Answer 2

$3.38

Explanation:

Hello, I think I can help you with this.

you can solve this by using a simple rule of three

Step 1

the cost per minute is increased by 30%, it means you have to pay 130% of the original price, or you can find the 30% and add this value to the initial cost, it is exactly the same

if

$2.06 ⇔100 %

$x? ⇔130%

do the relation and solve for x

`(2.06)/(100)=(x)/(130)\\\\isolate\ x\\x=(130*2.6)/(100)\\ x=(338)/(100) \\x=3.38`

so, the new price is $3.38.

Step 2

check finding the 30% and adding this value to the initial cost

$2.06 ⇔100 %

$x? ⇔30%

do the relation and solve for x

`(2.06)/(100)=(x)/(30)\\\\isolate\ x\\x=(30*2.6)/(100)\\ x=(75)/(100) \\x=0.78`

$ 0.78+$2.6=$3.38

$3.38 =$3.38 ,ok

Have a good day.