Electropneumatic general-purpose pressure transducers convert supply pressure to regulated output pressure in direct proportion to an electrical

Question:

Electropneumatic general-purpose pressure transducers convert supply pressure to regulated output pressure in direct proportion to an electrical input signal. The cost of a certain transducer was $194 in 1985 when the M&S equipment index was at 789.6. If the price increased exactly in proportion to the M&S equipment index, what would its cost be in 2010 (midyear) when the index value was 1461.3?