Question

A vial of flu vaccine contains enough for 10 shots. This past year your health clinic gave 220 flu shots. How many vials should you order for next year if you anticipate a 10% increase in demand?

Answer 1

the ans is 22 [ a ] <------ 

but if it is 10% DECREASE (as written) 
the ans is 18 vials <----

Answer 2

Answer:

25 vials should be ordered for next year.

Step-by-step explanation:

A vial of flu vaccine contains enough for 10 shots.

This year health clinic gave 220 flu shots. So number of vials required this year will be = $\frac{220}{10}=22$ vials

Next year there is an estimation that we will require 10% more vials.

Now number of vials required next year = Number of vials this year + % increase

= 22 + 10% of 22

= 22 + $\frac{(22)(10)}{100}$

= 22 + 2.2

= 24.2

Since order of vaccine can not be placed in fractions or decimals, so 25 vials will be required.