Challenges - RendaPrime

Today's growth: compound interest by feel

One deposit, one rate, many months. Estimate the total, then see the curve against the straight line.

An income, a list of expenses, and three states for each. Fit inside the income without losing too much comfort.

A cash price, a number of instalments and a payment. Find the monthly rate hidden in an offer that calls itself interest free.

Estimate what a monthly contribution is worth after inflation and tax. Each try tells you whether the right answer is higher or lower than yours.