\(H=N+G\) \(\rightarrow3900=N+30\%N\) \(\rightarrow N=3000\left(nu\right)\)
\(\rightarrow\left\{{}\begin{matrix}A=T=20\%N=600\left(nu\right)\\G=C=30\%N=900\left(nu\right)\end{matrix}\right.\)
Ta có: \(A_1=T_2=10\%.1500=150\left(nu\right)\)
\(\rightarrow\) \(A_2=T_1=A-150=450\left(nu\right)\)
\(C_1=G_2=20\%.1500=300\left(nu\right)\)
\(\rightarrow G_1=C_2=G-300=600\left(nu\right)\)