Grayson recycles cans and bottles for money each week. An aluminum can is worth two cents and a plastic bottle is worth three cents. She drinks three aluminum cans of soda and five plastic bottles of water a week. How many cents does Grayson earn from recycling in a four-week month?
Grayson earns 2 * 3 = 
<gadget id="calculator">2*3</gadget>
<output>6</output>
6 cents from soda cans a week.
She earns 3 * 5 = 
<gadget id="calculator">3*5</gadget>
<output>15</output>
15 cents from water bottles a week.
Thus, she earns 6 + 15 = 
<gadget id="calculator">6+15</gadget>
<output>21</output>
21 cents from recycling each week.
In a four week month, she earns 21 * 4 = 
<gadget id="calculator">21*4</gadget>
<output>84</output>
84 cents from recycling.

<result>84</result>