At the clothes store where Bianca works, she earns 3% of the amount she sells as a commission. Last week Bianca sold $900 worth of clothes. How much commission did Bianca earn

Sanderson is having trouble with his assignment. his shown work is as follows: − 3 7 7 3 = − 3 7 × 7 3 = − 21 21 = −1 however, his answer does not match the answer that his teacher gives him. complete the description of sanderson's mistake. find the correct answer.