The average cost for a gallon of gasoline increased from $2.56 one year to $3.18 the next year. What is the percent of increase, rounded to the nearest whole number?A.) 19%B.) 24%C.) 26%D.) 29%

from 2.56 to 3.18; 3.18-2.56=0.62 increased 
so if 2.56 represented 100%
       0.62 represents     ? %
cross multiply 
?%= 0.62·100/2.56=24.21875 which rounded to the nearest whole is 24%
Answer is B).