Rong has been saving 20 coins in his piggy bank every month. Neil has been saving 2/5 times more coins in his piggy bank per month than Rong. How many coins are they having ten years after they started their savings?
Neil has been saving 2/5 times more coins in his piggy bank per month than Rong, a total of 2/5*20 = 
<gadget id="calculator">2/5*20</gadget>
<output>8</output>
8 more coins.
The total number of coins that Neil has been saving in his piggy month per month is 20+8 = 
<gadget id="calculator">20+8</gadget>
<output>28</output>
28 coins.
If Rong has been saving 20 coins every month for ten years, the total number of months he's been saving for is 12*10 = 
<gadget id="calculator">12*10</gadget>
<output>120</output>
120 months.
Saving 20 coins every month for ten years, Rong has 20*120 = 
<gadget id="calculator">20*120</gadget>
<output>2_400</output>
2400 coins in his piggy bank.
If Neil has also been saving for ten years, he has saved 120*28 = 
<gadget id="calculator">120*28</gadget>
<output>3_360</output>
3360 coins in his piggy bank.
The total number of coins they both have in their piggy banks after ten years of saving is 3360+2400 = 
<gadget id="calculator">3360+2400</gadget>
<output>5_760</output>
5760.

<result>5_760</result>