Answer:
50%
Step-by-step explanation:
From the question we have here
If adults would pay 20$
Out of a 100% students:
60% would pay 15
40% would pay 10
If regular price = 20$
We are required to find discount
Discount = (20 - 10)/20 x 100
Discount = 0.5 x 100
Discount = 50%
The museum should offer 50percent discount.