**Answer:**

**A computer costs $225 and a printer $150.**

**Step-by-step explanation:**

**Let c be the cost of a computer and p the cost of a printer, then:**

3c + p = 825

4c + 2p = 1200

Multiply the first equation by -2:

-6c - 2p = -1650

Add this to the second equation:

-2c = -450

**c = 225.**

Now substitute c = 225 in the first equation:

3*225 + p = 825

**p** = 825 - 675 = 1**50.**

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