Annanya works in a company where she earns Rs 8750 pm. Her friend Siddhu earns twice as much as Annanya in same company. After 3 months Annanya salary is increased by Rs 2500. How much did Siddhu earn by the end of 6 months

Question

$\begin{array}{11} (a)\;155000 \\ (b)\; 157500 \\(c)\; 81024\\ (d)\;967990 \end{array}$