💰 Mental math trainer: 60-second sprint
Solve as many problems as you can in one minute.
Payment/mo
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Total
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Total interest
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Share: principal vs interest
⬛ Principal⬛ Interest
📋 Rules for borrowers
- 📌 Payment ≤ 35% of net income — otherwise it gets tight.
- 📌 Extra repayments save interest — get the clause in the contract!
- 📌 Fix the rate 10–15 years — protection against rate jumps.
- 📌 Check SCHUFA before applying — errors cost interest points.
⚠️ Estimate only — exact terms come from your bank or broker (e.g. Interhyp, Dr. Klein).