(1) If you buy 200 yuan, I will give you a 60 yuan voucher, and * * * will buy 200+60=260.
Flowers only: 200(200+60)= 0.77(7.7% discount)
(2) If 50 yuan is deducted, the actual cost is 200-50= 150 yuan.
Flowers only: (200-50)÷200=0.75, (7.5% discount)
Conclusion: It is cost-effective to take 60 yuan vouchers.