A10% increase in cigarette prices has been found to result in a decrease of smokers. a. 2% b. 4% c. 10% d. 20%

B) 4%

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4% it's a fact
Hope this helps1

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post