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