[tex]C_1 = 60\\C_2 = C_1\cdot(-1/4) = -15\\C_3 = C_2\cdot(-1/4) = 15/4\\C_1+C_2+C_3 = 45+15/4 = 48.75[/tex]
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[tex]C_1 = 60\\C_2 = C_1\cdot(-1/4) = -15\\C_3 = C_2\cdot(-1/4) = 15/4\\C_1+C_2+C_3 = 45+15/4 = 48.75[/tex]