Найти p процентов от числа а, если:
1)a=400, p=27 => p/a *100% = 27/400 * 100% = 6,75%
2)a=2.5, p=120 => p/a *100% = 120/2.5 * 100% = 4800%
3)a=2500, p=0.2 =>p/a *100% = 0.2/2500 * 100% = 0.008%
4)a=4.5, p=2.5 =>p/a *100% = 2.5/4.5 * 100% ≈ 55.6%
Найти число, если p процентов от него равны b:
1)p=23%, b=690 => p = 0.23 => a = b/p = 690 / 0.23 = 3000
2)p=3.2%, b=9.6 => p=0.032=> a = b/p = 9.6/0.032 = 300
3)p=125%, b=3.75=> p = 1,25=> a = b/p = 3.75/1.25 = 3
4)p=0.6%, b=21.6 => p = 0.006=> a = b/p = 21.6/0.006 = 3600
Какой процент составляет число a от числа b:
1)a=24, b=120 => a/b * 100% = 24/120 * 100% = 20%
2)a=4.5, b=90=> a/b * 100% = 4.5/90 * 100% = 5%
3)a=650, b=13=> a/b * 100% =650/13*100%=5000%
4)a=0.08, b=0.48=> a/b * 100% =0.08/0.48*100%≈ 16.7%