$$15\times2\frac{3}{100}+10y=1$$
$y = -\frac{589}{200} = -2\frac{189}{200} = -2.945$
$$15\left(2\times 100+3\right)+1000y=100$$
$$15\left(200+3\right)+1000y=100$$
$$15\times 203+1000y=100$$
$$3045+1000y=100$$
$$1000y=100-3045$$
$$1000y=-2945$$
$$y=\frac{-2945}{1000}$$
$$y=-\frac{589}{200}$$
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