as per me: Minimum to buy from connivence store is 0. She will buy from other store in pack of four so what all unit digits we can have 4,8,2,6,0 options provided are 0,1,2,3,4 so she can buy in multiple of 5 when she buys 0,1,3,2,4 from the convince store so minimum number will be obviously 0 Akshit