In September 1997,the average cost for 1 gallon of home heating oil in New York City was $1.192 per gallon. By September 2008,it had risen to $4.173 per Gallon. What is the percent increase in those 11 years?round to the nearest percent

Data from 2005 for various age groups show that for each $100 increase in the median weekly income for whites, the median weekly income of blacks increases by $105. also, for workers of ages 25 to 54 the median weekly income for whites was $676 and for blacks was $527. (a) let w represent the median weekly income for whites and b the median weekly income for blacks, and write the equation of the line that gives b as a linear function of w. b = (b) when the median weekly income for whites is $760, what does the equation in (a) predict for the median weekly income for blacks?