Q. 1. John has decided to purchase a cellular phone, but he is confused about which rate plan to choose. The "occasional user" plan is $.20 per minute; regardless of explain how many minutes of airtime are used. The "frequent user" plan charges a flat rate of $40.00 per month for 180 minutes of airtime plus $.15 per minute for any time over 180 minutes.
Q2. Explain how much air time per month would john need to use before he upgrades from the occasional user plan to the frequent user plan?