Mr$.$ Mokhtar is considering opening a new foundry in Kajang, BB Bangi and Semenyih to produce high$-$quality product X$.$ He has assembled the following fixed cost and variable cost data:

Location Fixed cost per year $($RM$)$ Per unit costs $($RM$)$

Material Labor Overhead

Kajang $200,000\mathrm{.}20\mathrm{.}40\mathrm{.}40$

BB Bangi $180,000\mathrm{.}25\mathrm{.}75\mathrm{.}75$

Semenyih $170,0001\mathrm{.}001\mathrm{.}001\mathrm{.}00$

a$)$ Graph the total costs line

b$)$ Over what range of annual volume is each facility going to have a competitive advantage?

c$)$ What is the volume at the intersection of the BB Bangi and Semenyih cost lines?