Question

Karla earns $8 per hour of babysitting. She has $38 saved so far. She wants to buy a coat that costs $80, including tax. Fundamentum number of hours she needs to baby sit in order to buy the coat.

Answer 1

We are told that Carla earns $8 per hour. If "x" is the number of hours then the earnings for a given number of hours are:

`8x`

To this amount, we add the $38 she has saved:

`38+8x`

This is the amount she has per hour, now we need to determine when this amount will get to $80, therefore, we equate the earnings to 80:

`38+8x=80`

Now we solve for "x" first by subtracting 38 to both sides:

`\begin{gathered} 8x=80-38 \\ 8x=42 \end{gathered}`

Now we divide both sides by 8:

`\begin{gathered} (8x)/(8)=(42)/(8) \\ x=5.3 \end{gathered}`

Therefore, she needs to work 5.3 hours to get to $80.