Help on Math & Merchandising

Hi All,

Can you please help on these questions? I have solved them but just want to know if the answers r correct..

It's urgent ..

Q1:A photo machine operator purchased 20 packets of papers. The market price of a packet is Rs.144. He gets a discount of 17.5% and an additional 5% for cash. How much did he pay for the whole quantity?

Answer:

Price: 20*144=2880

Discount: 17.5+5 = 22.5

Price : 2880*(1-22.5) = 2232

Does it correct? or should i use the discounts as series discount?

----------------

Q2: The price of a laptop is RS.62,000.The series discounts are

15%, 18% & 5%. Find the net price.

Answer:

Net Price : 62000*(1-15/100)*(1-18/100)*(1-5/100) = 41053.30

Does it the net price or Discount? I want net price..

-------------

Q3: What is the percentage mark-up on sales if the cost price of the book would have been RS.153?

Answer:

Cost$: 153

Sale Price$: 200

Mark up $: 47

Mark up %: 47/153*100 = 31

is it correct?

----------------

Q4: After a mark -up of 30% on sales, a book sells for RS.200.

Answer:

Price$: 200

Markup %: 30

Cost $ : 200*(1+30/100)=153.85$

Does it correct?

Thanks in Advance