The Amazing Delivery Company delivers packages based on the package weight. Write the selection statement necessary to calculate and determine the value of totalShippingCharges, when provided the weightLbs of the package in pounds $($as a positive number$)$ from the user. Be sure to test for valid input as well. Use these given variable names and the following rate table in your calculations:

Weight of package in lbs Rate$/$cost per package

Less than $2\mathrm{.}5$ $$2\mathrm{.}50$

$2\mathrm{.}5$ to $4\mathrm{.}99$ $$3\mathrm{.}50$

$5\mathrm{.}0$ to $14\mathrm{.}99$ $$10\mathrm{.}75$

$15\mathrm{.}0$ to $20\mathrm{.}0$ $$15\mathrm{.}75$

Over $20\mathrm{.}0$ Not able to ship