Answer:
430 billion (430,000,000,000) is 4.3 x 10^11 in scientific notation
I think its 1.25ft but i could be wrong... sorry if im wrong
Store 1 : 12 paper towels for 3.60
3.60 / 12 = 0.30......30 cents per roll
store 2 : 10 paper towels for 3.50
3.50/10 = 0.35....35 cents per roll
the better deal is store 1 with paper towels costing 30 cents per roll
