David starts off at a salary of $10,000 per yer. at the end of each year, he will earn a 4% raise on his previous salary. what will be the first year that
he makes $15,000? if valerie starts off at a salary of $10,000 per year and receives an option of a constant raise of $500 then how many years until she first makes $15,000?

could somebody walk me through on how to do this?