Answer:
Entrance fee should be proportional to the number of visitors -- this means that if we divide entrance fee by number of visitors for each of them, we would have the same number.
Step-by-step explanation:
Museum C
%error=100(estimate-actual)/actual
%e=100(50-40)/40=25%
can't see the whole question but...
40(60/100)=24
so 24/40=3/5 carry a phone.
24 students carry a phone.
Answer: $10
Step-by-step explanation:
Given
Robin and his four friends bought tickets for
each
If each one of them bought a calculator then the total spendings are 
Suppose the cost of each calculator is 
Cost per person is given by 
For the group, it is 
Equate this to total spendings

thus, the cost of each calculator is 