Let's first find how many students bring their lunch to school. This is 30% of 300. To find this value, convert the percentage to a fraction (or decimal) and multiply:

Since 90 students bring their lunch to school, we can say 210 students do not bring their lunch to school. (300 - 90 = 210)
The top of “^” needs a number to solve it.
Answer:
i think the answer is one of the two answers $16 or $20.50. Sorry if it is wronge.
I think the best answer would be things that can be naturally replaced in a short period of time