Question $3(5$ points$)$

Table $9\mathrm{.}1,$ which shows the toll charges on a particular highway.

$\backslash$table$[[$TABLE $9\mathrm{.}1,],[$Toll Charge,Vehicles per Hour$],[$$$0,5000],[1,4000],[2,3000],[3,2500],[4,2200],[5,2000],[6,1800],[7,1600]]$

Refer to Table $9\mathrm{.}1$ to answer this question. If using the road was presently free, what toll charge would be necessary to reduce traffic by $40$ percent?