Question

Luis made 80% of what he made last week.If he made 72$ this week,how much did he make last week

Answer 1

Let

x--------> the amount in dollars that Luis make last week

we know that

$80\% =\frac{80}{100}=0.80$

$0.80x=72$ ------> equation that represent the situation

solve for x

Divide by $0.80$ both sides

$0.80x/0.80=72\ /0.80$

$x=72\ /0.80$

$x=90$

therefore

the answer is

$90$

Answer 2

Answer:

He made $90 last week

Step-by-step explanation:

Since we are told that Louis made 80% of what he made last week and since Louise made $72 this week, to get how much he made this week, we will follow the step below:

let x be the amount he made last week

80% of x = $72

80% ×  x = $72

$\frac{80x}{100}$  = $72

the fraction 80x/100 can be reduced to 4x/5. Hence;

$\frac{4x}{5}$  = $72

Multiply both-side of the equation by 5

$\frac{4x}{5}$  x 5 = $72 x 5

4x =360

Divide both-side of the equation by 4 to get the value of x

$\frac{4x}{4} = \frac{360}{4}$

On the left-hand side of the equation 4 will cancel-out 4 while on the right-hand side of the equation 360 will be divided by 4

x = $90

Therefore he made $90 last week