The Plantronics Discovery 640 Bluetooth headset has been discontinued. You might want to take a look at the M1100 Bluetooth headset, if you are in the market for a new, similar headset. However, if you need accessories for the Discovery 640, you can find those by going to the related link.
640
60% of 640= 60% * 640= 0.6 * 640= 384
30% of 640 = 30% * 640 = 0.3 * 640 = 192
48% of 640 = 48% * 640 = 0.48 * 640 = 307.2
85% of 640= 85% * 640= 0.85 * 640= 544
110% of 640= 110% * 640= 1.1 * 640= 704
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640
45% of 640 =0.45*640 =288
640