A personal-computer salesperson receives a base salary of $1,000 per month and a commission of 5% of all sales over $10,000 during the month. If the monthly sales are $20,000 or more, then the salesperson is given an additional $500 bonus. Let E(s) represent the person’s earnings per month as a function of the monthly sales.

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(A) Graph E(s) for 0 ≤ s≤ 30,000. (B) Find lim,→10,000 E(s) and E(10,000). (C) Find lim,20,000 E(s) and E(20,000). (D) Is E continuous at s = 10,000? At s 20,000?