Central bank of Nigeria issued treasury bills worth N31.94bn last week to tighten liquidity in the money market.
Market operators said the treasury bills were in two classes of 349- day and 160- day bills.Interest rates ranged between 17.98 percent and 18.59 percent.
The cost of borrowing in the inter bank market dropped from 8.5 percent to about 5 percent.
Matured treasury bills repayment boosted central banks account by N287.39bn to close the volume at N320.35bn.
Traders expect rates to remain flat in the coming weeks.