A store ordered 300 more than twice as many pens as it did pencils at $5 each. If the cost of a pencil was $4, and the store ordered 15 boxes, each having 80 pencils, calculate the total amount of money they paid for the stationery.
Let’s work this out in a step by step way to be sure we have the right answer.
18300
If the store ordered 15 boxes, each having 80 pencils, they ordered 15 * 80 = 1200 pencils.

If the cost of a pencil was $4, the store paid $4 * 1200 = $4800 for all the pencils.

Twice as many pens as pencils that the store ordered are 2 * 1200 = 2400.

If A store ordered 300 more than twice as many pens as it did pencils, it ordered 2400 + 300 = 2700 pencils.

Since the cost of the pens was $5, the store paid 2700 * $5 = $13500 for the pens.

The total amount of money they paid for the stationery is 13500 + 4800 = $18300.

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The answer is 18300