Please help step by step and extra credit as well

Another Sample Run $($using Scanner$)$: Sample Run $($Extra Credit using Scanner$)$:

Amount paid for stock: $255\mathrm{.}20$

Commission Amount: $5\mathrm{.}10$

Total Amount Paid $260\mathrm{.}30$

Another Sample Run $($Extra Credit using Scanner$)$:

Amount paid for stock: $32,510\mathrm{.}00$

Commission Amount: $487\mathrm{.}65$

Total Amount Paid $32,997\mathrm{.}65$

Another Sample Run $($Extra Credit using Scanner$)$:

Enter number of shares of stock purchased: $100{?}^{{?}^{{?}^{?}}{?}^{{?}^{?}}}$ you may use JOptionPane for input $an\frac{d}{o}r$ output

Enter number of shares of stock purchased: $100$ &entered by user

Enter stock price: $325\mathrm{.}00$ &entered by user

Enter Commission Percent: $.02$ &entered by user

Amount paid for stock: $32500\mathrm{.}0$

Commission Amount : $650\mathrm{.}0$

Total Amount Paid : $33150\mathrm{.}0$

$^^$ you may use JOptionPane for input and$/$or output