Betty always leaves a 20% Tip at restaurants. She can calculate it in two steps by adding the 20 % of the Original Cost to the Original Cost. If T = Tip and c = Cost she can do this using the formula T = c + 0.20c. She would rather use a formula that does this in one step.

i think the amount would be $140.62

sinn is the total amount of students now and m were the students before, you subtract them both (n-m) and divide that by m. then, since to get a percentage from a fraction you have to multiply by 100, your answer should look like this: n-m/m*100

step-by-step explanation: