13 . Joy's Java Cafe needs $4,000 cash per day for customer transactions . Joy has a choice between going to the bank first thing on Monday morning to withdraw $20 000 - enough cash for the whole week - or going to the bank first thing every morning for $4 ,000 each time . Joy puts the cost of going to the bank at $3 per trip . Assume that funds left in the bank earn precisely enough interest to keep their purchasing power unaffected by inflation . Joy's Java Cafe is open 5 days a week for 50 weeks each year . When the inflation rate is 10% Joy goes to the bank everyday instead of once a week . Joy's annual shoe leather costs of inflation equal A . $ 3 B . $150 $600 $750