You have been sent to the grocery store to get some groceries for your mom. you see a coupon for a $50 gas card for only $40 if you buy $50 worth of groceries. you know things have been tight at home and every penny counts. you decide to buy the gas card since your total was $55.25 for the items your mom sent you for. you have the money for the card your mom giving you $100 but you know you better be able to justify your spending the additional money. you come up with some questions that you know your mom will ask so you set to getting the answers to them.
based on the cost per gallon at your local service station of $3.489 per gallon and having the $50 gas card that you only paid $40 for you answer these questions.
1. how much did you save your mom?

The bike store marks up the wholesale cost of all the bikes they sell by 30% and andre wants to buy a bike that has a price tag of 125 what was the wholesale cost of the bike

Aprisoner is trapped in a cell containing three doors. the first door leads to a tunnel that returns him to his cell after two days of travel. the second leads to a tunnel that returns him to his cell after three days of travel. the third door leads immediately to freedom. (a) assuming that the prisoner will always select doors 1, 2 and 3 with probabili- ties 0.5,0.3,0.2 (respectively), what is the expected number of days until he reaches freedom? (b) assuming that the prisoner is always equally likely to choose among those doors that he has not used, what is the expected number of days until he reaches freedom? (in this version, if the prisoner initially tries door 1, for example, then when he returns to the cell, he will now select only from doors 2 and 3.) (c) for parts (a) and (b), find the variance of the number of days until the prisoner reaches freedom. hint for part (b): define ni to be the number of additional days the prisoner spends after initially choosing door i and returning to his cell.

The label on a can of lemonade gives the volume as 12 fl 0z or 355ml verify that these two measurements are nearly equivalent