embarrassment caused by careless

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Today an embarrassment thing happened to me.It just my own fault. near the break hour of work.one of my superioes ask me to help her to take something for another colleagues.and give money to me to pay for the things.I was so careless this time.I didn't count how much and took it and went away,and then put on my table.I wanted to changed shoes to go out,and i thought i didn't count how much,if it was not that number...however,I will count how much before..but this time..when i counted,as what i thought,less 50yuan.my god...I braced myself to talk my boss what happened.Luckily,she said maybe she gave the wrong number...... I should be careful everytime.