You want a ps4. your parents gave you a birthday present of 100$. you want to save $2.50 for every hour you work. how many hours will you have to work to save to buy your ps4 for $399

You will need to work 120 hours in order to earn 300$ to get the ps4.

120 HOURS

Step-by-step explanation:

120 Hours he earns $300

He also has $100 from his birthday gift

So he has $1 left

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.