For the Data $(0,1000),(1,900),(2,800),(3,700),(4,600),(5,500)$ , Where the First Number in Parenthesis Is

Multiple Choice

For the data $(0,1000) ,(1,900) ,(2,800) ,(3,700) ,(4,600) ,(5,500)$ , where the first number in parenthesis is $\mathrm{t}$ and the second number is the actual demand, if we fit a trend line of the form $y t=a+b t$ , the value of $\mathrm{b}$ obtained using the appropriate formulae is

A) 0
B) 900
C) -100
D) 100
E) 750