((4 * 1000,000) /( 106 * 1000,000,000)) * 100 = 0.004% which is definately more" like a homoeopathic amount". Maths is obviously not your strong point Doc.
The above is correct unless you use the British definition of a billion in which case the percentage becomes
((4 * 1000,000)/(106 * 1000,000,000,000)) * 100 = 0.000004% although according to Wiklepedia we have now adopted the american definition.