The maximum grade for a hand-propelled wheelchair ramp is 8.3%, and after a 30 in rise, you must have a flat platform to allow for rest. Suppose you are constructing a wheelchair ramp to these specifications. (a) To the nearest whole degree, what angle would the lowest part of the ramp make with the ground? (b) To the nearest foot, how long could this ramp be until you construct the flat platform? 12 inches = 1 foot.