Question 42459
{{{P = 17000 + 4500 * sin(pi*t/52)}}}
P = 20000
{{{20000 = 17000 + 4500 * sin(pi*t/52)}}}
{{{3000 = 4500 * sin(pi*t/52)}}}
{{{2 = 3 * sin(pi*t/52)}}}
{{{ sin(pi*t/52) = 2/3}}}
{{{arcsin(2/3) = .7297}}}
{{{.7297 = pi*t/52}}}
{{{37.948 = 3.141 * t}}}
{{{t = 37.948 / 3.141}}}
{{{t = 12.08}}}
t = about 12 weeks