Tia buys 3.5 ounces of rice. the rice cost $0.12 per ounce. how march money did tia spend on the rice? (who ever gets the question correct and shows the work will get brainy, and 16 pls or more)

3.5=.12x 
3.5*.12 you multiply .12 and 3.5 because each ounce is equal to 12 cents
.42 is how much she spent on rice

3.5 x 12 = 42 convert that to money and its .12 x 3.5 = .42
breaking it down 3 x 12 = 36      .5 x 12 = 6
if mulitipled by .5 it means take away half and half of 12 is 6
in the end
3 x 12 = 36
.5 x 12 = 6
 36 + 6 = 42 
i hope this helps