Q:

The number of plain books sold by store A and store B was 30% and 40% respectively then find a number of lined books sold by store A and store B together is what percent of total books available at store A? 

• 1
  $$ 23{4\over 7}\%$$
• 2
  $$ 25{5\over 7}\%$$
• 3
  $$ 22{6\over 7}\%$$
• 4
  25%
• 5
  None of these