help me to solve this......part-2 qs

[anvi]

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Original settings are 10 mA,1 sec.New time is 0.5 sec,what is new mA?Density remains same.
1.5
2.10
3.15
4.20

 

[mrkbds]

Original settings are 10 mA,1 sec.New time is 0.5 sec,what is new mA?Density remains same.
1.5
2.10
3.15
4.20

i think it is 4. 20

 

[sonibun]

i think it is 4. 20

exposure time inv.prop. to KVP and mA and direct.prop to anode film distance
so
x*o.5=10*1=20