Question

Pls solve these 3 questions
Pls be step by step
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Answer 1

19)

1. Let x be the cost price of radio
2. He sold radio for 5% profit i.e,sp=x+(5/100)x=(1.05)x
3. Had he sold for 490 less then he would get loss of 2% on cost price
4. hence (1.05)x-490=x-(20/100)x

On solving this equation we get value of x which is 1960 i.e, original cost price

18)

1. he invested 20/- on 20 erasers
2. he sold 20 erasers at one rupee each i.e, he sold 20 erasers for 20/-
3. Hence there is neither loss nor profit