Solution
18.2% of 890
= (18.2 *890)/100
= $$18.2 \times 8.9$$
= $$2 \times 9.1 \times 8.9$$
= $$ 2 \times [(9-0.1)(9+0.1)] $$
=$$ 2 \times (9^{2} - 0.1^{2})$$
= $$2 \times (81 - 0.01)$$
= $$ 2 \times 80.99 $$
=161.98
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