Step-by-step explanation:
999.99 × x% = 299.99
999.99÷100 × x = 299.99
9.9999 × x = 299.99
9.9999x = 299.99
D.B.S by 9.9999 to make x the subject
9.9999x÷9.9999 = 299.99÷9.9999
x=29.999299993
To the nearest tenth of a percent, x=30
Therefore, x = 30%