On joining a real estate firm, an employee must choose one of two salary options based on the weekly net profit. Let x denote the weekly net profit in dollars. - Option A: The weekly salary A(x) is $200 plus 6% of the weekly net profits. - Option B: The weekly salary B(x) is $440 plus an unknown % b of the amount of the weekly net profit that is greater than $5000. If option A= option B at the endpoints of the interval [4000,6200] (of weekly net profit), what is the value of b ? t the number of people infected is a quadratic function of demic has been running and has the form y=a(tb)2+c. If 5 and infects 245 people at its peak, what is the value of cted at time t=0