3(s-4) > 4s-12 i got s> 0 but im pretty sure thats incorrect so

How to do this , and can some one explain

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax

I’m stuck on this equation, anyone got the answer?