Tara's parents gave her $90 for her birthday. Not wanting to spend it, Tara put the money in a new bank account that gains 10% interest annually. If she doesn't withdraw the money at all, how much will she have after a year?
In one year, Tara's account will yield an interest of 10/100*90 = 
<gadget id="calculator">10/100*90</gadget>
<output>9</output>
9 dollars.
The total in her account will therefore be 90 + 9 = 
<gadget id="calculator">90+9</gadget>
<output>99</output>
99 dollars.

<result>99</result>