Answer:
a) 1.10 dollar per unit
b) It would better to purchase to India Shine.
Explanation:
2,200 bath / 10 bath per dollar = 220 dollars
per per unit: 220 dollars / 200 polished disk = $ 1.10 per unit
2,200 ruppe / 8 = 275 dollars
import from Sacramento or Thailand is indifferent as both cost 220 dollar or 1.1 per unit
with a 30% import tariff:
220 x (1 + 30% ) = 286 dollars
after tariff it is convinient to purchase to a local supplier in India for 275 dollars or 2,200 rupee rather than a foreing company