First off,we can find out how much an oz cost for each package:
Package of brown rice:
0.79÷16
=$0.049375
≈$0.049
Package of white rice:
3.99÷32
=$0.1246875
≈$0.125
Price of brown rice:$0.049 < price of white rice:$0.125
Therefore,brown rice is a better deal as it is cheaper.
Hope it helps!