mathematics
% = 1/100
result = 50% of 80
result = (50/100) x 80
result = 40
40 = result% of 80
40 = (result/100) x 80
(40 x 100)/80 = result
50 = result
40 = 5% of result
40 = (5/100) x result
(40 x 100)/5 = result
800 = result
75-50 = 25 ■ [incr-actual = diff]
(25/50)x100 = 50% ■ [diff/actual) x 100 = incr%]
distance formula, way point, mid point formula, haversine formula
sqrt((x2-x1)*(x2-x1) + (y2-y1)*(y2-y1))
