Since 2006, the amount of money spent at restaurants in a certain country has increased at a rate of 4% each year. in 2006, about $500 billion was spent at restaurants. if the trend continues, about how much will be spent at restaurants in 2016?

For this case we have the following exponential function:
 y = A (b) ^ x
 Where,
 A: initial amount
 b: growth rate
 x: time in years
 Substituting the values we have:
 y = 500 (1.04) ^ 10
 y = 740.1221425
 Rounding:
 y = $ 740 billion
 
 It will be spent at restaurants $ 740 billion in 2016

21, i'm pretty sure it's right lol