b$.$ What is the amount of the net decrease in cash during the month?

$fill in the blank $8$

c$.$ What is the amount of the net increase in owner's equity during the month?

$fill in the blank $9$

d$.$ What is the amount of the net income for the month?

$fill in the blank $10$

e$.$ How much of the net income for the month was retained in the business?