You express the values in which the teacher or tutor or whatever assigned you.
Tariq's bill is 7 units
pria's bill is 5 units
the differnce is 7-5 or 2 units
the differne in their bills is $14
threfor
2unit=$14
divide by 2
1unit=$7
so tariq's bill is 7 units
1unit=$7
times 7 both sides
7units=$49
tariq's bil is $49
The answer is 10 because its in the tens place
You just need to take (63÷105)×100