网页2017年6月29日 · To calculate 10% of 20% of 30%, you can use the formula (0.1)(0.2)(0.3) or simply multiply 10% (0.1) by 20% (0.2), which equals 0.02. Then, multiply 0.02 by 30%, which equals 0.006 or 0.6%. This means that 10% of 20% of 30% is equivalent to 0.6% of the whole number.