$$[4\cdot25+2\cdot25+15\cdot[2\cdot25-5\cdot(36:6-2\cdot2)]-24\cdot25\}:(27:3+1)$$
$-26400$
$$100+50+15\left(2\times 5-5\times 6\left(-2\right)\times 2-4\times 25\left(2\times 3\times 3+1\right)\right)$$
$$150+15\left(2\times 5-5\times 6\left(-2\right)\times 2-4\times 25\left(2\times 3\times 3+1\right)\right)$$
$$150+15\left(10-5\times 6\left(-2\right)\times 2-4\times 25\left(2\times 3\times 3+1\right)\right)$$
$$150+15\left(10-30\left(-2\right)\times 2-4\times 25\left(2\times 3\times 3+1\right)\right)$$
$$150+15\left(10-\left(-60\times 2\right)-4\times 25\left(2\times 3\times 3+1\right)\right)$$
$$150+15\left(10-\left(-120\right)-4\times 25\left(2\times 3\times 3+1\right)\right)$$
$$150+15\left(10+120-4\times 25\left(2\times 3\times 3+1\right)\right)$$
$$150+15\left(130-4\times 25\left(2\times 3\times 3+1\right)\right)$$
$$150+15\left(130-100\left(2\times 3\times 3+1\right)\right)$$
$$150+15\left(130-100\left(6\times 3+1\right)\right)$$
$$150+15\left(130-100\left(18+1\right)\right)$$
$$150+15\left(130-100\times 19\right)$$
$$150+15\left(130-1900\right)$$
$$150+15\left(-1770\right)$$
$$150-26550$$
$$-26400$$
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