Answer :
$650
Step-by-step explanation:
The principal amount recieves a simple interest every year. The simple interest rate is given as [tex]1.25\%[/tex].
It is given that the total amount after 20 years is $812.50
[tex]Total=Principal+Interest\textrm{ = }P+P\times i\times T[/tex]
Here [tex]P[/tex] is the principal amount, [tex]i[/tex] is the interest rate, [tex]T[/tex] is the time period.
[tex]812.50=P+P\times (1.25\times \frac{1}{100})\times 20yr=P\times 1.25\\P=650\$[/tex]
∴ Samson had $650 when he opened the account.