Suppose that a nation currently is producing combination E in the table below and on the graph of the production possibilities curve to the right. What is the opportunity cost of producing 20 million more tablet devices and moving to production combination

G?

Combination	Smartphones (millions per year)	Tablets (millions per year)
A	50.0	0
B	48.0	10
C	45.0	20
D	40.0	30
E	33.0	40
F	22.5	50
G	0.0	60

The opportunity cost of producing 20 million more tablet devices and moving from production combination E to production combination G is _____ million smartphones per year. (Enter your response rounded to one decimal place.)