Deposits $(+ £2)$ | Withdrawals $(- £3)$ | Calculation | Outcome |
... | ... | ... | ... |
$4$ | $1$ | $4 \times (+ £2) + 1 \times (- £3)$ | $+ £5$ |
$7$ | $3$ | $7 \times (+ £2) + 3 \times (- £3)$ | $+ £5$ |
$10$ | $5$ | $10 \times (+ £2) + 5 \times (- £3)$ | $+ £5$ |
... | ... | ... | ... |