Answer :
1) Given, 8% of x = 100
⇒ 
= 100
⇒ X = 1250
2) Given, 32% of x = 400
⇒ 
= 400
⇒ X = 1250
3) Given, 35% of x = 280
⇒ 
= 280
⇒ X = 800
4) Given, 45% of x = 405
⇒ 
= 405
⇒ X = 900
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