NEED ANSWER ASAP

The following table shows retail sales in drug stores in billions of dollars in the U.S. for years since 2000. Year Retail Sales 0 84.851 3 108.426 6 142.281 9 168.256 12 201 .797 15 222.266 Let S be the retails sales in billions of dollars t years after 2000. Based on the data, the linear function S(t) = 9.46t + 83.71 has been proposed as a good model. a) According to the model, the retails sales in the U. S. in 2009 will be approximately :] billions of dollars. (Round to two decimal places.) b) Compute the percentage error between the model prediction and the actual value for the year 2009. Round to 2 decimal places