Directions : Study the information carefully to answer the questions given below it.

Sidhartha has decided to start a new company ‘Sidhartha Travels’. He wants to buy some furniture-table, chair. Air conditioners. He also wants to buy a few desktops which will include monitor, CPU, keyboard and mouse. The cost of each table is 13.5 times the cost of a mouse and the cost of a chair is $\frac{3}{5}$ th of the cost of a table.
The cost of an Air conditioner is 5 times the cost of a chair. The cost of a monitor is $20 \%$ more than the cost of a chair, a CPU costs Rs. 1500 more than a table and the keyboard costs 4 times a mouse. The cost of a mouse is Rs. 1000.

What is the respective ratio between the cost of a CPU and the total cost of a mouse and a keyboard together?

(1) $3: 2$

(2) $4: 1$

(3) $3: 1$

(4) $5: 1$

(5) $5: 3$