Yes, higher volt but not lower.Capacitance should the same.
To repair a 680 microfarad capacitor, buy a new one and install it in place of the old one. It is unrealistic to attempt repair of a capacitor.
680
24% of 680= 24% * 680= 0.24 * 680= 163.2
680
12% of 680= 12% * 680= 0.12 * 680= 81.6
2% of 680 = 2% * 680 = 0.02 * 680 = 13.6
15% off of 680 = 85% of 680 = 680*85/100 = 578
680+250 is 930. 680 + 250 930
680 X 1/8 = 680/8 = 85
It is then 680 because 5 rounds up to 10
680, presumably.
70 - 680 = -610