Transportation: Subway bus 5+2=7 round trip 7= 14 yuan/day X 15 days =2 10 yuan.
Eat: breakfast 5+ box lunch 10+ dinner 10+ 2 bottles of mineral water 3=28 yuan X 15 days =420 yuan.
450+2 10+420= 1080 yuan. In addition, there are telephone charges and some unexpected small expenses, plus the travel expenses (spare) for not finding a return trip to work are the most basic expenses.
Of course, if you are lucky, you won't have to spend so much money to find it quickly.