B. 90/360, because this is 1/4 from circle. It's even shown in the picture.
Example: If you take a protractor at 180°, then if you mirror it, then 360° will comeout, i.e. a circle.
Answer:
Option B - The income earned in one month is $5.50.
Step-by-step explanation:
Given : At River Bank, checking account customers earn 0.75% interest a month on their account balances, pay no service fees for writing checks, and pay a monthly $2.00 financial charge.
To find : The income earned in one month on the checking account for a customer with an account balance of $1,000.
Solution :
Account balance of customer= $ 1,000
Interest earned in checking account= 0.75%
Financial charge= $2.00
Therefore, Income earned in one month on the checking account is given by 0.75% of 1,000 - $2
i.e, 



So, Option B is correct.
The income earned in one month is $5.50.
Answer ; 10x - 20
Explanation; Multiply each term in the parenthesis by 10. Then multiply the numbers, and you get your answer.