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A sales clerk in an electronics store earns commission on total weekly sales. What amount, in dollars, did the sales clerk earn as commission on last week’s total sales?

(1) The electronic store pays sales personnel a commission rate of 2 percent on total weekly sales.
Insufficient
We don't know total weekly sales as of last week.

(2) The amount of the sales clerk’s total weekly sales last week was $500 more than the sales clerk’s total weekly sales the previous week.
Insufficient
We only know the equation between last week's sales and previous week's sales but don't know exact figures.

Combining (1) and (2),
We still don't learn enough info to get exact dollar amount for last week's sales to determine commission amount.

(E) is the answer
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