Using the concept of percentages the total earning of Cara can be found to be $4200.
Percentage is a number expressed as a fraction of 100. The % sign means to divide the number by 100.
Cara's earning = commission + basic salary
basic salary = $1800 (this is constant)
commission = 6% of $40000
= (6/100)*40000
= $2400
Cara's earning = 1800 + 2400
Hence, her earning is $4200
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