Question: Average trade time in Ameritrade is 5 second. Ameritrade has promised its customers if trade time exceeds 25 second it is free (a $9.99 cost

Average trade time in Ameritrade is 5 second. Ameritrade has promised its customers if trade time exceeds 25 second it is free (a $9.99 cost saving for the customer.) There are 135000 average daily trades.

4. The new daily cost to Ameritrade (due to 50% improvement in service) is how many times of the original cost?

The potential answers are:

A: 9.97 times.

B: 6.25 times.

C: 5.75 times.

D: 12.18 times.

E: 6.52 times.

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