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a+20b - a - 16b + a + 12b - a - 8b + a + 4b = 56
3a - 2a + 36b - 24b = 56
a + 12b = 56
~~~~~~~~~~~ x 2
2a + 24b = 112
S25 = 25/2 x ( 2a + 24b)
S25 = 25 x 112/2
S25 = 25 x 56
S25 = 25 x 4 x 56/4
S25 = 100 x 14
S25 = 1.400