Source for this 100 million $ claim, Manohar Parrikar has already stated recently it cost $56 million to manufacture su 30mki in India.
""“The Sukhoi 30 choice is always there. What I mean to say is: upgrade the Sukhoi 30, make it more capable,” said India’s Defense Minister Manohar Parrikar.
The Su-30MKI fighter was specially developed for India by Russia’s Sukhoi Design Bureau and 200 aircraft has already entered IAF service as of August 2014.
The minister also made it clear that the IAF is concerned with the fighter costs.
“It is not always… go and purchase it. A cost effective purchase is also important,” he said.
The average cost of a Sukhoi Su-30MKI fighter jet is approximately $56 million, whereas France’s Rafale fighter varies from €64 million to €90 million ($75-$106 million).""
https://www.rt.com/news/222131-rafale-deal-under-question/
@MilSpec sir your view on this is the Indian tax payer being taken for a ride by this deal ?