Answer:
$472.50
Step-by-step explanation:
The simple interest is calculated with
[tex]A=P(1+rt)[/tex]
Where [tex]A[/tex] represents the final amount of money, [tex]P[/tex] is the principal, [tex]r[/tex] is the interest rate in decimal number and [tex]t[/tex] is the time.
So, from the problem, we have [tex]P=450;r=0.05;t=1[/tex]
Replacing these values, we have
[tex]A=P(1+rt)\\A=450(1+0.05(1))=472.50[/tex]
This means Marian has to pay $472.50
