The 15%-a-month maths
Lesson 12 of 13 in our free Build Wealth the Boring Way guide: a 5-minute money game with the key points below.
This lesson is in the full version.
Free with a code from your uni, college, council, landlord or employer (worth £600/year). Lesson 1 of Build Wealth the Boring Way is free for everyone.
Got a code? Unlock this lesson
Questions you'll answer
1.15 multiplied by itself 12 times: by how many times would money multiply in ONE year at 15% a month?
At 15% a month, compounded for 3 years (36 months), what would £1,000 become?
Rule of 72 check: at 15% a month, roughly how often would money double?
Quick facts
- Red flag: “Make 15% a month, compounded, with zero risk.” — Impossible maths plus 'zero risk'. 15% a month is about 435% a year.
- Red flag: “Student results: £1,000 to £1 million in 3 months!” — Even 15% a month would take about 49 months to get there. The claim doesn't even match its own maths.
- Red flag: “Only 7 places left at this price!!” — Fake scarcity to stop you thinking.
- Red flag: “Pay the £997 fee in crypto for a bonus.” — Crypto payments are hard to trace or get back.
- Red flag: “Earn a commission for every friend who signs up.” — Recruit-your-friends rewards are a Ponzi or pyramid pattern.