function calculateTotalCost$()\{$

const backpackPrice $=$ Number$($document$.$getElementById$(\text{'}$back$-$price'$).$textContent$)$;

const calculatorPrice $=$ Number$($document$.$getElementById$(\text{'}$calc$-$price'$).$textContent$)$;

const textbookPrice $=$ Number$($document$.$getElementById$(\text{'}$text$-$price'$).$textContent$)$;

const taxRate $=0\mathrm{.}13$;

const subTotal $=$ calculateSubtotal$($backpackPrice$,$ calculatorPrice, textbookPrice$)$;

const salesTax $=$ calculateSalesTax$($subTotal$)$;

const totalCost $=$ calculateTotal$($subTotal$,$ salesTax$)$;

console.log$(\text{'}$Subtotal: $$\text{'}+$ subTotal.toFixed$(2))$;

console.log$(\text{'}$Sales Tax: $$\text{'}+$ salesTax.toFixed$(2))$;

console.log$(\text{'}$Total Cost: $$\text{'}+$ totalCost.toFixed$(2))$;

$\}$

function calculateSubtotal$($backpack$,$ calculator, textbook$)\{$

return backpack $+$ calculator $+$ textbook;

$\}$

function calculateSalesTax$($subTotal$)\{$

const salesTax $=0\mathrm{.}13$;

return subTotal $*$ taxRate;

$\}$

function calculateTotal$($subTotal$,$ salesTax$)\{$

Can you fix my code. Keep in functions like this