SAT/ACT Prep Practice Problems

SAT, ACT, New SAT, PSAT  and SAT Subject Test Practice Problems are provided for students of OptimalSATPrep.com and others.

An Function Problem for SAT/ACT/SAT Subject Test (Hard). Target Time. 40-50 sdeconds/part.

A mobile phone manufacturer charges $200/phone and sells 20000 phones each month at this price. For every increase of $20 in price, the number of phones sold goes down by 1000.  #SAT #ACT

1. How many phone will be sold/month if the price is set to $300?

2. What will be the monthly revenue from the sale of phones at $300/phone?

3. What will be the monthly revenue if each phone is sold at $X (200 =< X =< 600)?