The message claims that $500 invested today will be worth $518.7 after 20 years.
Interest is a cost you incur when borrowing money and when lending money. Interests often is expressed as a daily percentage of the borrowed amount. These percentage represents the loan's interest rate. There are three types in interest: simple (normal) interest, interest earned, & compound interest.
Annual compounding of compound interest formula:
amount=P(1+([tex]\frac{R}{100}[/tex])ⁿ
Substitute P = $500 , R = 3.75% and n = 20
amount=500*(1+[tex]\frac{3.75}{100}[/tex])²⁰
=500*([tex]\frac{103.75}{100}[/tex])²⁰
=518.7
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