Clare buys some shares for $50x. Later, she sells the shares for $(600 + 5x). She makes a profit of x% (a) Show that x^2 + 90x − 1200 = 0

Profit is (New price-Original price)/Original price . As a fraction it is percentage Profit/100. Equate (New price-Original price)/Old Profit to the fraction of Profit in %/100. Cross multiply and come up with a quadratic eqation. 0 (600+5x-50x)/50x=x/100 to give 100(600-45x)=50(x^2) Divide through by 50 2(600-45x)=(x^2) Move all on one side to end up with x^2 + 90x − 1200 = 0

Answered by Raj H. Maths tutor

11674 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Write 870,000,000 in standard form


The price of a book is 4 pounds. In a sale the price is reduced by 30 percent. Work out the sale price


Please factorise and solve x^2 -1 = 0


The first 4 terms of a different sequence are: 9, 13, 17, 21. Find an expression for the nth term of the sequence


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences