Question:
The graph below shows the number of pens sold at a bookshop at the end of each month over 5 months last year.
(a) Which 1-month interval has the greatest increase in the number of pens sold?
(b) Find the ratio of the number of pens sold in January to the total number of pens sold in 5 months. Leave your answer in the simplest form.
Solution:
![P6 / Maris Stella / 2019 / SA2 / Paper 2 – Q15 [5 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2020/06/P6_Maris_Stella_2019_Prelims_Paper2_Q15-Qns.jpg?resize=400%2C260&ssl=1)
![P6 / Raffles Girls / 2020 / SA2 Prelims / Paper 2 – Q15 [4 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2020/11/P6_Raffles_Girls_2020_SA2_Paper2_Q15-Qns.jpg?resize=400%2C260&ssl=1)