1. Martha pays 20 dollars for materials to make earrings. She makes 10 earrings and sells 7 for

5 dollars and 3 for 2 dollars. Write a numerical expression to represent this situation and then

find Martha's profit?

Numerical expression to represent this situation : 41 = 20 + P

Martha's profit is $21

Step-by-step explanation:

Total cost price for earrings for Martha = total money invested in material to make earrings = $20

No. of ear rings made = 10

No. of earrings sold for $5 = 7

Total Price for these 7 earrings = $5*7 = $35

No. of earrings sold for $2 = 3

Total Price for these 3 earrings = $2*3 = $6

Total price for all of the ten earrings = $35+$6 = $41

We know that

selling price = cost price + profit

Total price for all of the ten earrings = Total cost price for 10 earrings + total profit made on those 10 earrings

let total profit be P

41 = 20 + P

Thus,

P = 41-20 = 21

numerical expression to represent this situation : 41 = 20 + P

Thus, Martha's profit is $21