Demand for stereo headphones and MP$3$ players for joggers has caused Nina Industries to grow almost $50$ percent over the past year. The number of joggers continues to expand, so Nina expects demand for headsets to also expand, because, as yet, no safety laws have been passed to prevent joggers from wearing them. Demand for the players for last year was as follows:

MONTH DEMAND $($Units$)$ FORECAST

$14,220$

$24,320$

$34,020$

$44,420$

$55,020$

$64,720$

$75,320$

$84,920$

$95,420$

$105,720$

$116,320$

$126,020$What is the slope of the line? $($Use either Excel Slope function or Excel Data Analysis Tool$-$Regression$)($Round your answer to the nearest whole number$)$

Question $9$ options:

a$)$

$192$

b$)$

$3787$

c$)$

$291$

d$)$

$129$