Shares of Nikola Corp NKLA.O tumbled 11.0% after the electric truck maker said it plans to sell shares and raise $100 million. By Amruta Khandekar and Ankika Biswas March 31 (Reuters) - The S&P 500 was set to end its second straight quarter on a high note on Friday, as evidence of cooling inflation further supported hopes of a softer monetary policy approach from the Federal Reserve in light of recent banking sector problems. A closely watched Commerce Department report on Friday showed U.S. consumer spending rose moderately in February, while inflation also cooled.