Carla and rob left a 20 percent tip after having lunch at a restaurant. the amount of the tip was 6$. carla's lunch cost 15$. write an equation you can use to find x, the cost of robs lunch
this is worth 40 !

Frank is lending $1,000 to sarah for two years. frank and sarah agree that frank should earn a real return of 4 percent per year. instructions: a. the cpi (times 100) is 100 at the time that frank makes the loan. it is expected to be 113 in one year and 127.7 in two years. what nominal rate of interest should frank charge sarah?