F.1 Mathsmatics H.W.~~快~~

1.If discount % = 20% , discount = $45 , what is the selling price?
price=45x(1-20%)
=45x0.8
=$36
2.A game player marked at $780 is sold at a 10% discount . Find the discount .
discount=780x(1+10%)
=780x1.1
=$858
3.In a shop , a doll marked at $480 is sold for $420 in a sale . Find the discount percent .
discount percent=(420/480)x100%
=(7/8)x100%
=87.5%
4.digital clock marked at $230 is sold at a 30% discount . Find the selling price.
price=230x(1-30%)
=230x0.7
=$161
5.Mike buys a football at a 15% discount .If he saves $42 , find the marked price of the football.
price=42x(1-15%)
=42x0.85
=$35.7

1) 45x(1-20%)
=45x80%
=$36
2) 780x(1+10%)
=780x110%
=$858
3) (420/480)x100%
=(7/8)x100%
=87.5%
4)230x(1-30%)
=230x70%
=$161
5) 42x(1-15%)
=42x85%
=$35.7

1.If discount % = 20% , discount = $45 , what is the selling price?
45÷20％=225

2.A game player marked at $780 is sold at a 10% discount . Find the discount .
780×10％=78

3.In a shop , a doll marked at $480 is sold for $420 in a sale . Find the discount per cent .
(480-420)÷480×100％=12.5％

4. digital clock marked at $230 is sold at a 30% discount . Find the selling price.
230×(1-30％)=161

5.Mike buys a football at a 15% discount .If he saves $42 , find the marked price of the football.
42÷15％=280