Evaluate the formula for $\displaystyle{t}={10}\usepackage{cmbright}\Huge\$ to find the value of d: $\displaystyle{d}={120}{{\left({0.99}\right)}}^{{10}}\usepackage{cmbright}\Huge\$

$\displaystyle{d}={120}{\left({0.90438}\ldots\right)}={108.52584}\ldots\usepackage{cmbright}\Huge\$

There will be about 108 deer left in the park after 10 years.