Answer:
Total earning of Cara of last month is $4200.
Explanation:
As given
Cara earns a base pay of $1800 per month at a car dealership plus a commission of 6% of her sales.
Cara sells $40000 worth of merchandise .
6% is written in the decimal form .

= 0.06
Commission price = 0.06 × Total cost of sales
= 0.06 × 40000
= $2400
Total Cara earns = Base pay + Commission price
= $1800 + $2400
= $4200
Therefore total earning of Cara of last month is $4200.