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? (5 points)

a
52.7 ⋅ 1014 tons

b
52.7 ⋅ 107 tons

c
5.27 ⋅ 107 tons

d
5.27 ⋅ 1014 tons