Round to the Nearest Tenth Unless Indicated Otherwise $\mathrm { V }$

Round to the nearest tenth unless indicated otherwise.
-The volume $\mathrm { V }$ of a given mass of gas varies directly as the temperature $\mathrm { T }$ and inversely as the pressure $\mathrm { P }$ . If $\mathrm { V } = 400.0 \mathrm { in } ^ { 3 }$ when $\mathrm { T } = 400 ^ { \circ }$ and $\mathrm { P } = 15 \mathrm { lb } / \mathrm { in } ^ { 2 }$ , what is the volume when $\mathrm { T } = 100 ^ { \circ }$ and $\mathrm { P } = 15 \mathrm { lb } / \mathrm { in } ^ { 2 } ?$

A) $130.0$ in $^ { 3 }$
B) $100.0 \mathrm { in } ^ { 3 }$
C) $60.0$ in $^ { 3 }$
D) $90.0 \mathrm { in } ^ { 3 }$