Simple calculation of 3.6 times 11 minus 0.36
3.6x11-0.36
=3.6x10+3.6x1-0.36
=36+3.6-0.36
=39.6-0.36
=39.24
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36 * 3 / 4 + 63 * 3 / 4 + 3 / 4
36*(3/4)+63*(3/4)+(3/4) = 75