Question 31·Easy·Percentages
A school cafeteria normally sells 240 sandwiches per day. After introducing a new menu, sales increased by 25%. How many sandwiches are now sold per day?
For percent increase questions, first decide whether you are being asked for the amount of the increase or the new total. A fast method for the new total is to multiply the original amount by (here, for a increase). Alternatively, compute the percent of the original, then add it to the original. Always check that your answer is larger than the starting value when the problem says there is an increase.
Hints
Understand the phrase "increased by 25%"
If a quantity is increased by , you keep the whole original amount and then add of that original amount to it.
Calculate the amount of the increase
Find of 240. You can multiply by , or by , to get the size of the increase.
Get the new total
Once you know how many sandwiches represent the increase, add that number to 240 to find the new daily sales.
Desmos Guide
Compute the new sales directly
In Desmos, type either 240*1.25 or 240 + 0.25*240 into an expression line. The value that appears is the new number of sandwiches sold per day after the 25% increase.
Step-by-step Explanation
Find 25% of 240
An increase of means you add an amount equal to times the original.
Calculate the increase:
So the number of sandwiches increased by 60.
Add the increase to the original amount
Now add the increase to the original 240 sandwiches:
So the cafeteria now sells sandwiches per day.