explain and demonstrate how to change 4/20 into a percent

what does it mean to get a 150% salary raise explain in words then give an example showing a calculation

A 150% salary raise means that an employee's salary is increased by 150% of its original amount. For example, if an employee's original salary was $50,000, then a 150% salary raise would be an increase of $75,000, making the new salary $125,000. This can be calculated by multiplying the original salary by 1.5 ($50,000 x 1.5 = $75,000).