Stephanie is 12 years old and often assists neighbors on weekends by babysitting their children. Calculate the 2021 standard deduction Stephanie will claim under the following independent circumstances (assume that Stephanies parents will claim her as a dependent).

a. Stephanie reported $1,150 of earnings from her babysitting.

b. Stephanie reported $2,040 of earnings from her babysitting.

c. Stephanie reported $18,265 of earnings from her babysitting.