By Andrea Shalal TOKYO (Reuters) – The global price of oil could surge by 40% to around $140 per barrel if a proposed price cap on Russian oil is not adopted, along with sanction exemptions that would allow shipments below that price, a senior U.S. Treasury official said on Tuesday. U.S. Treasury Secretary Janet Yellen will discuss implementation of the U.S. price cap proposal and global economic developments with Japanese Finance Minister Shunichi Suzuki when they meet later on Tuesday, the official said. The goal was to set the price at a level that covered Russia’s marginal cost of producti…