Reason: After the 3000 yuan voucher is used, it is assumed that something happens 35 16 yuan.

35 16-3000 = 5 16 (yuan)

I paid 5 16 yuan, which means I used a voucher.

5 16-5 16 = 0 (yuan)

Just finished reducing it.

So what I bought was actually 35 16 yuan.