Final answer:
The couple should pay Rs24000 in taxes in a year.
Step-by-step explanation:
To calculate the tax that the couple should pay in a year, we need to determine the annual income and then calculate the taxes based on the given tax rates. The monthly income of the couple is Rs50000, so their annual income would be 50000 x 12 = Rs600000.
The tax is levied at 1% up to the annual income of Rs400000. So, the tax on the first Rs400000 would be 400000 x 0.01 = Rs4000.
The remaining income is Rs600000 - Rs400000 = Rs200000. The tax rate for the remaining income is 10%, so the tax on this amount would be 200000 x 0.10 = Rs20000.
Therefore, the total tax that the couple should pay in a year is Rs4000 + Rs20000 = Rs24000.