First we will convert 850 g into kilograms.

Since 1 kg = 1000 g follows 1 g = 1/1000 kg thus:

850 g = 850*(1/1000) kg = 0.85 kg

Now we find the cost of 0.85 kg rice by multiplying 0.85 with the cost per kg, 0.92:

0.85*0.92 = 0.782

For 805 g she will pay 0.782.