Marge has saved $350 toward the cost of her vacation. The vacation will cost $1,750. What percent of the cost of the vacation has Marge saved?
Percent comes from two word; "per" means 'divide by', "cent" means '100'. [eg: century = 100 years) So, "percent" means
'divided by 100'.
so (part cost)/(whole cost)=(part percent)/whole percent) and a 'whole percent' is 100%.
Notice how the dollar signs cancel and the only unit left is percent.