Sofia's grandmother gives her $$150$ each month, which she spends on pizzas and burgers. Usually, she buys $4$ pizzas for $$120$ and spends the remaining $$30$ on $4$ burgers. However, the price of $1$ pizza has increased by $$15$; the price of a burger has not changed. Now, Sofia will buy only $2$ pizzas per month.

Calculate how many burgers Sofia can afford to buy if she still wants to spend all the money.