Answer:
Step-by-step explanation:
[tex]S_{n}[/tex] = [tex]\frac{a_{1} (1-r^{n} )}{1-r}[/tex]
[tex]S_{75}[/tex] = [tex]\frac{10(1-0.9^{75} }{1-0.9}[/tex] = 10(1 - 0.00037) / 0.1 = 99.96
