Adam's father deposited $2000 in the bank. It receives 8% interest paid throughout the year, and he withdraws the interest as soon as it is deposited.  How much will Adam’s father have, including his deposit and the interest received after 2 and a half years?
The annual interest is 2000 * 8/100 = $
<gadget id="calculator">2000*8/100</gadget>
<output>160</output>
160.
Interest for two and a half years is 160 * 2.5 = $
<gadget id="calculator">160*2.5</gadget>
<output>400</output>
400.
So, Adam's father will have 2000 + 400 = $
<gadget id="calculator">2000+400</gadget>
<output>2_400</output>
2400 after 2 and a half years.

<result>2_400</result>