exam Maths Puzzle Numerical Ability

(Use 6 steps)
Given: angle A and angle B, and Angle c and angle D are complementary angles.
measure of angle B = measure of angle D
Prove: angle a is congruent to angle C.

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thank you so much for your help. Sam invested $7,500 for one year, part at 12% annual interest and the rest at 10% annual interest. His total interest for the year was $890. How much money did he invest at 12%.