Jennifer makes 30 equilateral triangles of equal perimeter. She colors 24 triangles with red and remaining triangles with blue. Colouring 2 triangles with blue cost as much as colouring 3 triangles with red. If colouring 1 triangle with red costs Rs. 10, find the cost of colouring all triangles.

• A. Rs. 360
• B. Rs. 350
• C. Rs. 340
• D. Rs. 330
• E. None of these