DAY 66

Comment

1 % is 1/100, so ...

Answer

1/200.

Readers' methods

Lorna R, Bedford MK45:
1 % = 1/100, so half of 1 % = 1/100 * 1/2 = 1/200.

Hazel R, Norwich NR12:
0.5/100 x 10/10 = 5/1000 = 1/200 .

Tom H, Sevenoaks TN13:
Half of one percent means
one half (1/2) multiplied by (of) one percent (1/100),
which is 1/2 x 1/100, which is 1/200.