{640 of 8 - (12)2 of 6} - 900 = ?
{640 of 8 - (12)2 of 6} - 900 = ? => {5120 - 864} - 900 = ? => ? = 4256 – 900 => ? = 3356
If the ratio of the sum invested and simple interest received after 1 year is 25:7 respectively, then find the rate of interest.
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