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?
a.52.7 ⋅ 1014 tons
b.52.7 ⋅ 107 tons
c.5.27 ⋅ 107 tons
d.5.27 ⋅ 1014 tons