The population of Mojave was 4000 a decade ago. If the town's population has increased three times, and the population analysis firm predicts that it will increase by 40% after five years, how many people will be in Mojave in five years?
Since the population of Mojave has increased three times the number it was a decade ago, there are 3*4000 = 
<gadget id="calculator">3*4000</gadget>
<output>12_000</output>
12000 people in Mojave now.
It's predicted that the population will increase by 40/100*12000 = 
<gadget id="calculator">40/100*12000</gadget>
<output>4_800</output>
4800 people after five years.
This means there will be 12000+4800 = 
<gadget id="calculator">12000+4800</gadget>
<output>16_800</output>
16800 people living in Mojave in five years.

<result>16_800</result>