1st bill in drawing and counting from my son

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He saw a transformers toy in supermarket, cost RMB 119,and wants to buy it. He came back home, counting his saving but only 40, still short 79? What he should do? He came to me, asking me for 79. I tried to persuade him to give up … failed, he followed me here and there, insisting , finally I promised him "tomorrow", he is so happy and reminds me do not forget, but I do not feel so happy, I am beated. In next morning, I found this BILL with his drawing and counting in my bag, hahahaaa. I finally feel so funny and interesting! OK, pay it!