In January, Bill's labrador puppy weighs 40 pounds and his dachshund puppy weighs 12 pounds. Each dog gains 25% of their starting weight over the year. What's the difference in their weight at the end of the year?
First find how much weight the labrador puppy gains: 40 pounds * 25% = 
<gadget id="calculator">40*25*.01</gadget>
<output>10</output>
10 pounds.
Then add that weight gain to the puppy's starting weight: 40 pounds + 10 pounds = 
<gadget id="calculator">40+10</gadget>
<output>50</output>
50 pounds.
Then find how much weight the dachshund puppy gains: 12 pounds * 25% = 
<gadget id="calculator">12*25*.01</gadget>
<output>3</output>
3 pounds.
Then add that weight gain to the puppy's starting weight: 12 pounds + 3 pounds = 
<gadget id="calculator">12+3</gadget>
<output>15</output>
15 pounds.
Then subtract the dachshund puppy's weight from the labrador puppy's weight to find the difference: 50 pounds - 15 pounds = 
<gadget id="calculator">50-15</gadget>
<output>35</output>
35 pounds.

<result>35</result>