Matthew gets £100 for his 16th birthday and chooses to invest the money into a bank with a 2% annual interest rate. By which birthday will Matthew have more than £150 in his account?

This a geometric sequence with first term 'a' as 100 and common ratio 'r' of 1.02. 100 x 1.02n > 150 1.02n > 150/100 =1.02n > 1.5 log10(1.02n) > log10(1.5) Using power rule, n[log10(1.02)] > log10(1.5) n > log10(1.5)/log10(1.02) Using calculator, n > 20.47531886 This means the amount exceeds £150 after 21 years. 16 + 21 = 37 Therefore, the answer is: by Matthew's 37th birthday, the amount exceeds £150.

Answered by Maths tutor

3418 Views

See similar Maths A Level tutors

Related Maths A Level answers

All answers ▸

Find the centre and radius of the circle with the equation x^2 + y^2 - 8x - 6y - 20 = 0.


if f is defined on with f(x)=x^2-2x-24(x)^0.5 for x>=0 a) find 1st derivative of f, b) find second derivative of f, c) Verify that function f has a stationary point when x = 4 (c) Determine the type stationary point.


Differentiate the following, y=(2x-4)^3


Express as a simple logarithm 2ln6 - ln3 .


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning