Calculating Net Charge: How Many Electrons Does it Take?

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ceity

Homework Statement

Find the net charge of a system consisting of 2.0×10^7 electrons.

e = 1.60 * 10^-19 C

(1.60 * 10^-19) * (2.0×10^7) = 3.2 * 10^-10

...but I got it incorrect. I'm confused as to how else I'm supposed to solve this.

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Check those exponents.