The total amount that Jerome would earn is the sum of the basic salary and the commission he gets based on the number of bikes he is able to sell.
Let x be the number of bikes he sold. With this representation, the total commission he will get is 12x.
The sum of 200 and 12x should be greater than 400. The equation that best represent the given is scenario is,
200 + 12x > 400
Transposing 200 to the other side of the equation,
12x > 400 - 200
Simplifying,
12x > 200
Dividing the equation by 12 will give us the final answer of,
x > 16.67
ANSWER: 17 bikes