The anser is 1(as in a pound or dollar)or 100 as in 100 pennies or cents.That's what we learnt two days ago when I started year 1 becos I am 5 years old.
1 2 5 10 20 50 100 200 500 1000 2000 5000 10000 20000 50000 etc
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50
100 200 20
20 + 50 + 20 + 10 = 50 = 150
1 x 5 = 5 5 x 10 = 50 ; 10 is 5+5 50 x 20 = 1000; 20 is 10+10 1000 x 40 = 40,000 ; 40 is 20 + 20 40,000 x 80 = 3,200,000; 80 is 40+40 therefore the next 2 numbers are 40,000 and 3,200,000
20% of 50= 20% * 50= 0.2 * 50= 10