Four numbers

The first number is 50% second, the second number is 40% third, the third number is 20% of the fourth. The sum is 396. What are the numbers?

Correct result:

a =  12
b =  24
c =  60
d =  300

Solution:

a=0.50 b b=0.40 c c=0.20 d a+b+c+d=396  0.50 0.40 0.20 d+0.40 0.20 d+0.20 d+d=396  0.50 0.40 0.20 d+0.40 0.20 d+0.20 d+d=396  1.32d=396  d=300  c=0.20 d=0.20 300=60 b=0.40 c=0.40 60=24 a=0.50 b=0.50 24=12
b=24
c=60
d=300



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