Ouyang Inc reports 2012 revenue of $20 billion. During 2012, its A/R rose by $0.8 billion, A/P increased by $1.3 billion, inventories decreased by $0.2 billion and unearned revenue increased by $0.6 billion. Its ratio of revenue to cash collected from customers of 2012 is closest to:

1.84

1.63

1.48

1.24

1.01