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20 degrees.

Step-by-step explanation:

We can assign variables for this problem. We can see that the overall angle adds up to 100 degrees, with Angle 1 being four times Angle 2, where Angle 2 being a random variable we can call x.

Using this information, we can conclude that Angle 1 is 4x and Angle 2 is x.

We can add those variables together, equal it to 100 degrees since ABD is known to be 100 degrees, to find variable x, and input it to find angle 2.

4x+x=100          (make equation)

5x=100              (add like terms)

x=20                  (isolate x)

We know that x stands for 20, and since angle 2 is just x, the answer is just 20 degrees.

therefore;

let angle 2 be x

angle ABD=100°

x+4x=100°

5x= 100° (dividing both sides with 5)

we get ;

x=20°

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step-by-step explanation:

25% is the answer