Calvin buys a pack of chips, for $0.50, from the vending machine at lunch, 5 days a week. After 4 weeks, how much money has Calvin spent on chips?
The chips cost $0.50 a bag and he buys them 5 days a week so that's .50*5 = $
<gadget id="calculator">0.50*5</gadget>
<output>2.5</output>
2.50 a week.
If he spends $2.50 on chips a week then over 4 weeks he will spend 2.50*4 = $
<gadget id="calculator">2.50*4</gadget>
<output>10</output>
10.00 on chips.

<result>10</result>