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My Alliance India phone bill for the month of May is Rs B. On top of this, there is a service tax of S% which is to be levied upon this value. But since they are having a guilt feeling of overcharging their customers fraudulently, they offer a discount of D% also on top of this. So, my billing goes like this
But surprisingly, my final bill is equal to Rs B itself.
Now, which of the following is true regarding S and D (assume all the values to be positive)?