(https://i.ibb.co/TBVqK8gn/6in011a1ohvg1.jpg)
There's only one option that's a multiple of 41.
Just look at the options – only 123 is a multiple of 41.
You can either compute 2475 × 41% ÷ (15% × 55%) = 2475 × 41 × 100 ÷ (15 × 55) = 12,300 – just handle the arithmetic.
Or, since you're multiplying by a prime and nothing divides it, just pick the option that's a multiple of 41. Only 12,300 fits.
Start with X × 15% × 55% = 2475.
That means X × 3/20 × 11/20 = 2475.
So X = 2475 × 20/3 × 20/11.
X = 825 × 20 × 20/11.
X = 75 × 20 × 20.
Now X × 41% = 75 × 20 × 20 × 41/100.
=> 1500 × 41/5.
=> 300 × 41.
=> 12300.
2475 × 100/55 × 100/15 = 30,000.
Then 30,000 × 41% = 12,300.
In this new 15-minute format, try to get comfortable with numbers.
For example, 2475 = 25×99 = 55×45 = 11×225 = 15×165 and so on.
The method is shown below, and you can also verify it by checking the option that's a multiple of 41.
(https://i.ibb.co/1JqNV1XN/kyez18356ivg1.jpg)