need help for Antenna problems

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Please I need Answers to these problems:

an RF transmitter has an output power Pt = 25dBm radiates from an antenna having 20dB gain. What is the distance from the transmitting antenna where the power radiated is 70% of the power transmitted

A link between two central offices 50km apart is to be designed at 7GHz. The antennas' gain (Tx and Rx) are equal = 30dB, the total feeding system loss is 10dB/m, the branching element has 3dB/unit. If the antenna heights are 65m and 80m, calculate the system gain required to satisfy the link budget assuming 20dB fade margin. (path loss = 32.4+20 log(d)+20log(f), d in km and f in MHz)
 

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