A percent increase starts with the original amount, which counts as . If a question gives the usual count and says it increased, add the stated percent to , then type that new percent of the original count in Desmos. Taking only the added percent gives the increase, not the new total.
Hints
- Hint 1
The original amount is the count before the menu changed. It represents of the usual sales. After a increase, what percent of the original is sold each day?
- Hint 2
The word of points to the amount you start with: sandwiches. Type the new percent of in Desmos, rather than finding only the sandwiches added.
Step-by-step
Find the new percent, then calculate
Step 1Include the original sales
The cafeteria keeps its usual sandwiches and adds of that amount. So the new total is this percent of the original:
An increase includes the original , not only the percent added.
- Step 2
Calculate the new daily count
Type in Desmos. It displays . The is the base, the amount the percent is taken of, so the cafeteria now sells sandwiches per day. Choice C.