Mumbai: Gold finance companies Manappuram FinanceNSE 0.72 % and Muthoot FinanceNSE 0.39 % rallied on Thursday after the RBI in its sixth bi-monthly monetary policy said that it will assign risk weights for rated exposure of banks to all NBFCs. While Muthoot Finance ended up 6.5 per cent to Rs 515.60 and Manappuram Finance gained 7.7 per cent to Rs 104.05 on Thursday. Earlier, claims on exposure of …