Price of crude oil falls 4% in past week on surplus supply

Brent crude had slid to its lowest price since late June earlier in the week

Saudi Arabia and Russia, the world's two biggest oil exporters, have called for all Opec+ members to join an agreement on output cuts for the good of the global economy.

Global crude oil prices fell for seven straight weeks, their first in half a decade, on worries about a supply surplus and weak Chinese demand. 

The price of Brent crude traded on Friday was up 2% at $75.50 on the day but had slid to its lowest since late June earlier in the week, a sign many traders believe the market is oversupplied. The price of Brent crude was on track to fall 4.4% for the week, the biggest losses in five weeks.