Math formula problem, there is a hotel, someone wants a package. But prices at all levels have to double. Five are on the first floor. Let's go Second floor, 10. Let's go Third floor, number 20. Let's

Math formula problem, there is a hotel, someone wants a package. But prices at all levels have to double. Five are on the first floor. Let's go Second floor, 10. Let's go Third floor, number 20. Let's go an=a 1×q^(n- 1)

Layer 1: 5 * 2 0 = 5 * 1 = 5.

2 5*2^ 1=5*2= 10

3 5*2^2=5*4=20

4 5*2^3=5*8=40

........

2 3 = 2 * 2 * 2 = 8 instead of 2*3=6.