Stephanie is 12 years old and often assists neighbors on weekends by babysitting their children. Calculate the 2020 standard deduction Stephanie will claim under the following independent circumstances (assume that Stephanies parents will claim her as a dependent).

a. Stephanie reported $900 of earnings from her babysitting.

b. Stephanie reported $1,590 of earnings from her babysitting.

c. Stephanie reported $17,115 of earnings from her babysitting.