The amounts of plastic waste generated in a region during two years were 32,400,000 tons and 20,300,000 tons. What was the total plastic waste generated over these two years in the region, expressed in scientific notation?

52.7 ⋅ 1014 tons
52.7 ⋅ 107 tons
5.27 ⋅ 107 tons
5.27 ⋅ 1014 tons