chads from a hole-punched five pound note

dimensions variable

Note surface area = 13.4 x 6.9cm = 92.46cm²

Chad surface area = pi x r² = pi x 0.3cm² = 0.2827cm²

1 chad = (0.2827 ÷ 92.46) x 100 = 0.3058% of £5

Value of 1 chad = 0.3058 x £5 = 1.53p

Value of 116 chads = 1.53p x 116 = £1.773644 = £1.77