Answer:
100 N
Step-by-step explanation:
Let us first find the mass of the person when they are on the earth's surface
![F=G(Mm)/(r^(2) )\\](https://img.qammunity.org/2020/formulas/physics/high-school/px7t7owpsv4mfbtiuxqp1cvj47zeyl4arf.png)
Now let us see how F changes if the distance between two masses is doubled
![F_(1) = G(Mm)/((2r)^(2) ) = (1)/(4) *G(Mm)/(r^(2) )](https://img.qammunity.org/2020/formulas/physics/high-school/v7jm0mgqzg726zy1bsrn8wt2v2oc1r8usb.png)
So when the distance of separation is doubled, the force of gravity between the two masses decreases by a factor of four
Therefore her new weight = 400 N/4 = 100 N