Figure below shows a plot of current I through the cross-section of a wire over a time interval of 12s. How much charge flows through the wire during this time period?

10 C 50 C 20 C 25 C

50 C

Charge passing through the wire is area under I vs t diagram. $\Rightarrow q = \text{area of traingle + area of rectangle }= \frac{1}{2} \times 5\times 4 + 8 \times 5 = 50 C$