first form an equation: 500+(500*0.02x)=y
2% is the annual interest so 2 months would be 1/6 (of 2%.
2% of $500 is $10. 1/6 of of $10 is $1.67.
Add that to your initial $500, and you get $501.67, so your $500 dollars will be worth $501.67 after 2 months