The table below shows the saturation vapour pressure against temperature in a certain town. If the vapour pressure in this town at 20^oC is 10mmHg, what is the relative humidity?

T(oC)	0	5	10	15	20	40	60
S.V.P (mmHg)	4.58	6.51	8.94	12.67	17.50	55.10	149.00

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