Answer:
The shoe salesman will earn a commission of=$74
Explanation:
Step 1: Value of sales
Express the total value of sale the shoe salesman makes as follows;
Total value of sales=number of shoes sold×price per shoe
where;
Number of shoes sold and price per shoe=2 pairs each at $80
number of shoes sold a and price per shoe=3 pairs each at $70
replacing;
Total value of shoes sold=(2×80)+(3×70)=$370
Total value of shoes sold=$370
Step 2: Calculate how much the shoe salesman earns
The expression for how much the shoes salesman will earn is as follows;
A=r×c
where;
A=total amount of the shoe salesman income
r=commission rate
c=total value of sales
In our case;
A=unknown
r=20%=20/100=0.2
c=$370
Step 3: Substitute values in the expression
A=20% of $370
A=0.2×370
A=74
The shoe salesman will earn a commission of=$74