Write a Web$-$based application consisting of a Web form

$($calc$-$tax.html$)$ and a PHP program $($calc$-$tax.php$).$ The application should:

ask the user for a purchase amount; calculate a reduced purchase amount

based on a $25\%$ discount $($this is $0\mathrm{.}75$ times the purchase amount$)$;

calculate the tax on the reduced amount $(7\%$ or $0\mathrm{.}07$ of the cost$)$;

calculate the total cost; display the reduced purchase amount, tax, and

total cost.